Best Dual Axle Trailer Suspension for Tandem Axles

#1 · Best Overall

1. SOUTHWEST WHEEL USA-Made Kit

• Package Dimensions: 28 x 8 x 8 in
• Weight: 30 lb

Best for: USA-made 5,200-pound tandem kits.

Why it ranks #1: A dedicated 5,200 lb tandem kit includes four 2,900 lb, 5-leaf springs, a hanger kit with Dexter equalizers, and two U-bolt kits.

Four USA-made EMCO five-leaf springs rated at 2,900 pounds each lead this SOUTHWEST WHEEL kit, which is listed for 5,200-pound tandem axles. A USA-made hanger kit with Dexter equalizers and two 3-inch U-bolt kits bring springs and mounting hardware into one package.

The springs measure 25-1/4 inches eye to eye and 1-3/4 inches wide, giving buyers specific dimensions for comparing their existing suspension. SOUTHWEST WHEEL says the hanger kit’s Dexter equalizers minimize wear and enhance articulation, connecting the included linkage to suspension movement and service life. Two USA-made 3-inch U-bolt kits secure the suspension components, while the stated 2,900-pound capacity per spring identifies the spring rating. The listing says the kit fits Dexter axles and other standard 5,200-pound tandem axles.

Skip it if you require springs explicitly rated at 3,000 pounds each; this kit lists 2,900-pound springs.

This kit suits buyers assembling a standard 5,200-pound tandem suspension with USA-made springs, Dexter equalizers, hangers, and U-bolts together. Match the listed 25-1/4-inch spring length and 1-3/4-inch width to the trailer before choosing it.

Listed on Amazon as: SOUTHWEST WHEEL USA Made 5,200 lbs. Dual Trailer Axle Suspension Kit Incl. Leaf Springs, Hanger & U-Bolt kit

#2 · Best 3,500 lb Kit

2. SOUTHWEST WHEEL 3,500 lb Kit

• Package Dimensions: 35 x 16 x 11 in
• Weight: 75 lb

Best for: Complete 3,500-pound suspension refresh.

Why it ranks #2: This complete tandem package pairs four 25 1/4-inch, 1,750 lb springs with a shackle kit and two 2 3/8-inch round U-bolt kits.

Four 25-1/4-inch, 4-leaf double-eye springs anchor this SOUTHWEST WHEEL kit, each rated at 1,750 pounds for a 3,500-pound tandem trailer axle setup. A shackle kit and two 2-3/8-inch round U-bolt kits accompany the springs, giving buyers several core suspension components together.

The springs measure 1-3/4 inches wide and are rated at 1,750 pounds apiece, so their stated capacity aligns with the listed 3,500-pound axle application. Having the shackle kit and two round U-bolt kits in the same package can simplify sourcing the related mounting pieces for a tandem suspension job. The 25-1/4-inch eye-to-eye measurement gives a concrete dimension for comparison with existing springs. The listing notes that slight component imperfections may be considered normal industry standards, not defects.

Skip it if you require parts with no acknowledged cosmetic or manufacturing imperfections; the listing says slight flaws may occur.

Consider this kit for a 3,500-pound tandem trailer needing springs, shackles, and round U-bolts together. Its stated spring dimensions support comparison before purchase, while the notice about slight imperfections may not suit buyers expecting flawless parts.

Listed on Amazon as: SOUTHWEST WHEEL 3,500 lbs. Tandem Trailer Axle Suspension Kit (Leaf Springs, Shackle & U-Bolt kit)

#3 · Best Higher Capacity

3. SEHNSUCHT 6,000 lb Kit

• Package Dimensions: 29 x 13 x 6 in
• Weight: 93.8 lb

Best for: Higher-capacity SW5 spring setups.

Why it ranks #3: Its five-leaf springs are rated at 3,000 lb each and specified for standard 5,200–6,000 lb trailer axles.

Five-leaf double-eye springs rated at 3,000 pounds each distinguish this SEHNSUCHT kit from lighter spring sets, with the listing assigning it to standard 5,200- to 6,000-pound trailer axles. The SW5 replacement designation and included U-bolt and hanger kit position it for a higher-capacity tandem suspension replacement.

The springs measure 25-1/4 inches eye to eye, 1-3/4 inches wide, and have 9/16-inch bushings, giving buyers useful dimensions to compare against their existing setup. SEHNSUCHT identifies heavy-duty carbon steel construction and says the springs provide transmission stability and friction damping, connecting material and design to suspension operation. The kit includes U-bolt and hanger components alongside the springs, reducing the need to source those separately. The listing instructs installers to tighten nuts horizontally for the intended user experience.

Skip it if you need SW4B-style 1,750-pound springs; this kit is the SW5 replacement with 3,000-pound-capacity springs.

Choose this set for a tandem trailer in the listed 5,200- to 6,000-pound axle range that needs SW5-style springs and mounting hardware. Compare its 25-1/4-inch length and spring capacity with the existing suspension before installation.

Listed on Amazon as: Replacement for SW5 5 Leaf Trailer Leaf Spring, 6000LB Tandem Trailer Axle Suspension Kit with 3000lb Capacity Double Eyes Leaf Springs, 2 U-Bolt and Hanger Kit

#4 · Best Rust Protection

4. AEagle 3,500 lb Kit

• Package Dimensions: 29 x 15 x 6 in
• Weight: 78.8 lb

Best for: Round-axle 3,500-pound tandem setups.

Why it ranks #4: The kit supplies four 1,750 lb springs for 3,500 lb trailers and lists electroplated paint and 60Si2Mn manganese steel.

Four 4-leaf double-eye springs rated at 1,750 pounds each give this Aeagle kit a clearly defined match for 3,500-pound trailer axles. Its 25-1/4-inch eye-to-eye length and included U-bolt and hanger hardware make it a spring-and-mounting-parts option for a tandem suspension refresh.

The 1-3/4-inch-wide springs have 9/16-inch bushings and a 3-inch free-open measurement, useful reference points when matching the replacement suspension to existing geometry. Aeagle specifies 60Si2Mn manganese steel and says its spring plates provide shock absorption for a smoother, more stable ride. An electroplated rust-resistant coating addresses exposure during service. The package includes four springs and a 3,500-pound-axle U-bolt kit; the listing also identifies a tandem hanger kit, so buyers can source several suspension components together.

Skip it if you have a square axle; this kit is explicitly limited to round axles.

Choose this kit for a round-axle, 3,500-pound tandem trailer needing four double-eye springs and mounting parts in one purchase. Its defined spring dimensions aid matching, but the round-axle restriction rules it out for square-axle setups.

Listed on Amazon as: AEagle 25-1/4" 4-Leaf 1750lb Capacity Double Eye Spring for 3500lb Trailer Axle & U-Bolt & Tandem Hanger Kit, 1.75" Width, 3" Free Open Suspension Kit Replaces SW4B, 4 PCS

#5

5. Magorfas 3,500 lb Kit

• Package Dimensions: 29 x 15 x 6.5 in
• Weight: 80.8 lb

Best for: Round-axle SW4B hardware bundles.

Why it ranks #5: This 3,500 lb option provides four double-eye springs rated 1,750 lb each, plus listed shackle bolts, locknuts, and eight U-bolts.

This Magorfas bundle pairs four 1,750-pound-capacity springs with long shackle bolts and eight 5-1/2-inch U-bolts, giving a 3,500-pound trailer axle refresh a substantial set of mounting hardware. Its title specifies SW4B compatibility and round trailer axles, clearly narrowing the intended fit.

The four springs are listed for 3,500-pound trailers, with a 1,750-pound capacity per spring. The included fourteen 3-inch shackle bolts use 9/16-18 threads and come with locknuts, while the eight 1/2-inch-diameter U-bolts measure 5-1/2 inches long. Those specified hardware dimensions help buyers assess the mounting package against their suspension layout. Because the listing calls out round axles and SW4B fit, it is aimed at a defined replacement application rather than a universal axle kit.

Skip it if you must match a documented spring eye-to-eye length; the supplied listing does not state that dimension.

This bundle fits buyers seeking SW4B-style parts for a round-axle, 3,500-pound trailer, especially those who want specified shackle bolts and U-bolts included. The missing spring length calls for extra care when comparing existing suspension dimensions.

Listed on Amazon as: Tandem Trailer Leaf Spring 4 Leaf Double Eye 1750 lbs Cap for 3500 lbs Axle Suspension, Hanger & U-Bolt kit 25-1/4" Length fits for SW4B, for Round Trailer Axles- Set 4

#6

6. SEHNSUCHT 3,500 lb Kit

Best for: SW4B-style 3,500-pound spring replacements.

Why it ranks #6: Its four-leaf, 1,750 lb springs are sized for standard 3,500 lb axles, with 25 1/4-inch eye-to-eye length and 1 3/4-inch width.

Each of this SEHNSUCHT kit’s four double-eye springs carries a stated 1,750-pound capacity, making the set a targeted replacement option for standard 3,500-pound trailer axles. Its 25-1/4-inch eye-to-eye length and SW4B replacement designation give buyers concrete starting points for checking a spring refresh.

The 1-3/4-inch-wide, 4-leaf springs have 9/16-inch bushings and a 3-inch free-open measurement, helping buyers compare the kit’s geometry with their existing suspension before installation. The listing identifies carbon steel construction and includes installation hardware, so the purchase covers more than springs alone. SEHNSUCHT specifically cautions that the nuts should be tightened horizontally; following that direction matters to the stated installation outcome. The set is presented for tandem axles using the standard 3,500-pound axle class.

Skip it if you need a verified piece-by-piece hardware inventory before ordering; the listing does not enumerate those components.

This set suits owners replacing SW4B-style double-eye springs on a standard 3,500-pound tandem trailer who value included installation hardware. Check the listed spring dimensions and follow the horizontal nut-tightening instruction during installation.

Listed on Amazon as: 4 Leaf of Replacement for SW4B Trailer Leaf Spring, 3500lb Tandem Trailer Axle Suspension Kit with 1750lb Capacity Double Eyes Leaf Springs, 2U-Bolt and Hanger Kit

#7 · Best Hardware Set

7. TRAILER SUPPLIES APT5

• Weight: 21.4 lb

Best for: Broad-range tandem hanger replacements.

Why it ranks #7: This hardware-only set fits double-eye springs on 3,500–7,000 lb tandem trailers and includes equalizers, hangers, shackle straps, bolts, and nuts.

Compatibility with tandem axles rated from 3,500 to 7,000 pounds gives this TRAILER SUPPLIES APT5 hanger kit a broad stated application range. Its package centers on double-eye spring mounting hardware, including triangle equalizers and hangers, rather than replacement springs or a complete running-gear assembly.

The kit is specified for 1-3/4-inch-wide double-eye springs and includes six 3-1/4-inch-tall front, center, and rear hangers plus two 7-3/4-inch triangle equalizers. Eight 2-5/8-inch shackle straps and fourteen 3-inch shackle bolts with locknuts complete the listed hardware set. These component counts and dimensions help buyers plan a tandem hanger replacement and compare mounting pieces with their existing setup. High-strength steel construction and anti-rust protective oil are listed for durability and protection in road and weather exposure.

Skip it if you need leaf springs or axles included; this APT5 package contains tandem hanger and linkage hardware.

Consider the APT5 for replacing tandem hanger and equalizer hardware on a 3,500- to 7,000-pound setup using 1-3/4-inch double-eye springs. Its detailed component set supports planning, but springs must be sourced separately.

Listed on Amazon as: Tandem Axle Trailer Suspension Kit – Universal Double Eye Leaf Spring Hangers for 3,500–7,000 lb Axles – All-in-One Hardware Set – APT5

#8

8. Dexter Heavy Duty Kit

• Weight: 13.22 lb

Best for: Dexter tandem equalizer overhauls.

Why it ranks #8: A focused replacement kit for 1 3/4-inch double-eye springs includes equalizers, bronze bushings, shackle links, and hardware for 33-inch axle spacing.

Two equalizers and eight bronze bushings make this Dexter kit a focused choice for refreshing tandem suspension connections rather than replacing leaf springs. It is specified for 1-3/4-inch-wide double-eye springs and 33-inch axle spacing, helping buyers identify the suspension layout it serves.

The package includes four shackle links, four shackle link assemblies, six wet step bolts, and the locknuts and bronze bushings needed for the listed linkage assembly. Two equalizers complete the central tandem connection components. Those parts can support a coordinated hardware replacement without requiring a separate search for each listed connection piece. Dexter specifies 33-inch axle spacing and 1-3/4-inch-wide double-eye springs, so the kit’s application is defined by both suspension spacing and spring width; it is not a leaf-spring set.

Skip it if you need replacement leaf springs in the box; this Dexter kit supplies suspension linkage and equalizers instead.

Pick this kit when servicing Dexter-compatible tandem linkage for 1-3/4-inch double-eye springs at the specified 33-inch axle spacing. It suits a hardware overhaul, but buyers replacing worn springs will need to source springs separately.

Listed on Amazon as: Dexter Axle (K71-359-00) Heavy Duty Suspension Kit

#9

9. Salo 95-inch Running Gear

Best for: 95-inch hub-face running gear builds.

Why it ranks #9: This is a broader running-gear package with suspension, electric-brake axles, and tires; its 95-inch hub face and 80-inch spring center define fitment.

A 95-inch hub face paired with an 80-inch spring center defines this Salo Trailer Parts running-gear kit for 5,200-pound tandem axles. It combines electric-brake axles with suspension parts, mounted radial tires, and wheels, enabling a broader trailer running-gear installation than a spring-only purchase.

The kit is rated for 10,400 pounds total across the tandem axles and specifies a 3-inch axle tube with a 6-on-5.5-inch bolt pattern. Those dimensions help narrow its fit to trailers matching the listed 82-inch-wide-frame guidance, 95-inch hub face, and 80-inch spring center. Included electric-brake axles, leaf springs, U-bolts, and hangers cover suspension and braking components, while ST225/75R15 radial tires arrive mounted on six-lug wheels. The package is a substantial running-gear assembly, not just suspension hardware.

Skip it if you have a trailer requiring an 89-inch hub face and 74-inch spring center; Salo's B0CZ779BG9 lists those dimensions.

Choose this complete running-gear package for a trailer matching its 95-inch hub face, 80-inch spring center, and 6-on-5.5-inch pattern. It suits buyers replacing axles, brakes, suspension, tires, and wheels together, not those seeking springs alone.

Listed on Amazon as: 5200 lb Tandem Trailer Axle Kit, 95 in Hub Face, 80 in Spring Center, 6 on 5.5 Bolt Pattern, Electric Brake Axles, Running Gear Kit

#10

10. Salo 89-inch Running Gear

Best for: 76-inch-frame electric-brake builds.

Why it ranks #10: It includes suspension within a full running-gear package, but its 89-inch hub face and 74-inch spring center make it a more specific axle-system fit.

The 89-inch hub face and 74-inch spring center distinguish this Salo Trailer Parts running-gear kit for 5,200-pound tandem axles. It combines electric-brake axles, suspension hardware, and mounted radial tires with wheels, serving buyers replacing more than leaf springs alone.

The listing gives the tandem axles a 10,400-pound total capacity, a 3-inch axle tube, and a 6-on-5.5-inch bolt pattern. Its 89-inch hub face and 74-inch spring center are specified for most 76-inch-wide trailer frames, providing concrete dimensions for checking fit. The full suspension kit includes leaf springs, U-bolts, and hangers alongside electric-brake axles. ST225/75R15 radial tires come mounted on six-lug wheels, combining several running-gear components in one package.

Skip it if you need a 95-inch hub face and 80-inch spring center; Salo's B0CZ7733BQ lists those larger dimensions.

This is a fit-specific choice for a 5,200-pound tandem trailer matching the 89-inch hub face, 74-inch spring center, and six-lug pattern. It suits a broad running-gear replacement, while spring-only shoppers need a smaller-scope kit.

Listed on Amazon as: 5200 lb Tandem Trailer Axle Kit, 89 in Hub Face, 74 in Spring Center, 6 on 5.5 Bolt Pattern, Electric Brake Axles, Running Gear Kit