Selecting the right leaf spring kit is essential for smooth towing, axle alignment, and load distribution on dual-axle trailers. This guide highlights top dual axle leaf spring kits that span 3,500 to 5,200 lbs per axle, and up to 7,000 lbs total trailer capacity. Each entry includes installation essentials such as U-bolts, hangers, and shackle kits to help you compare options quickly. Durable manganese steel construction and eye-to-eye compatibility are key themes across these selections, designed to withstand road wear and weather.
| Product | Brand | Per-Axle Capacity | Included Kits |
|---|---|---|---|
| SOUTHWEST WHEEL 5,200 lbs. Dual Trailer Axle Suspension Kit | SOUTHWEST WHEEL | 2 x 2,900 lbs | Leaf springs, Hanger kit, U-bolt kit |
| SOUTHWEST WHEEL 3,500 lbs. Tandem Trailer Axle Suspension Kit | SOUTHWEST WHEEL | 3,500 lbs total (1,750 lbs per spring) | Shackle kit, U-bolt kit |
| AEagle 25-1/4″ 4-Leaf 1750lb Capacity | Aeagle | 1,750 lbs per spring | U-bolt kit, tie plates |
| dreamdragon 7,000 lbs Tandem Suspension Kit | dreamdragon | 3,500 lbs per spring | 6-leaf springs, U-bolts, hangers |
| Youxmoto 4pcs 5-Leaf 3,000 Lb Each | Youxmoto | 3,000 lbs per spring | U-bolt kit, hangers |
SOUTHWEST WHEEL 5,200 Lbs Dual Axle Suspension Kit
The 5,200 pounds per pair kit uses four 5-leaf double-eye springs rated at 2,900 pounds each. This setup includes a tandem trailer hanger kit and two 3-inch round U-bolts, each with a 9/16-inch diameter shackle bolt compatibility. The heavier dual-eye design improves load distribution across dual axles, helping to minimize sag and uneven wear. Nylon bushings are included to reduce noise and increase longevity. This kit is suitable for heavier trailers that require robust suspension support and straightforward installation.
SOUTHWEST WHEEL 3,500 Lbs Tandem Suspension Kit
This kit features four 4-leaf double-eye springs with 25-1/4″ eye-to-eye length and 1-3/4″ leaf width. Each spring carries 1,750 pounds, delivering balanced load support across tandem axles. The inclusion of a shackle kit and two 2-3/8″ round U-bolts ensures complete hardware for installation. This option is well-suited for mid-weight trailers that require a reliable, easy-to-install suspension upgrade with proven performance under mixed road conditions.
AEagle 25-1/4″ 4-Leaf 1750lb Capacity
AEagle’s 25-1/4″ eye-to-eye, 4-leaf springs provide 1,750 pounds of capacity per spring. This kit includes a complete 3500 lbs axle U-bolt kit, tie plates, and all required fasteners. Designed as a direct replacement for SW4B systems, it emphasizes precise dimensions (eye-to-eye, width, free open) and robust fasteners. The kit is suitable for 2-3/8″ diameter axles and emphasizes corrosion resistance with coated manganese steel parts. Users should verify compatibility with their existing hangers and mounting hardware before installation.
dreamdragon 7,000 lbs Tandem Suspension Kit
Each trailer leaf spring in this kit is rated for 3,500 pounds, aligning with a typical 7,000 pounds axle system. The 25-1/4″ eye-to-eye length, 3″ free open height, and 6-leaf design promote even load distribution and reduced chassis stress on long hauls. Made from manganese steel (60Si2Mn) with corrosion-resistant coating, these springs are designed for durability in varying climates and have two coats of paint for added protection. The kit includes 6-leaf assemblies, U-bolts, and hangers for complete assembly on tandem axles.
Youxmoto 4pcs 5-Leaf 3,000 Lb Per Spring
Youxmoto offers a direct replacement set with five-leaf springs rated at 3,000 pounds per spring for 5,200–6,000 pounds trailer configurations. The kit includes U-bolts and hangers designed to fit SW5 configurations, with precise eye-to-eye dimensions (25-1/4″), 3″ free open, and 9/16″ bushings. Notably, the instruction notes that horizontal tightening of nuts is critical for proper operation. This setup emphasizes a complete hardware bundle for a straightforward swap and reliable road performance.
Buying Guide
- Compatibility and eye-to-eye length: Match the spring length to your trailer’s axle spacing and installation points (common sizes include 25-1/4″ eye-to-eye).
- Capacity and per-spring rating: Add the per-spring capacity to estimate total axle capacity; oversizing can improve ride quality but may require compatible hangers and shackle hardware.
- Leaf count and design: More leaves generally yield better load distribution and ride comfort, but check weight, clearance, and mounting hardware.
- Material and corrosion protection: Look for manganese steel (60Si2Mn) with protective coatings for longevity in harsh conditions.
- Included hardware: Ensure U-bolts, shackle kits, and hangers are appropriate for your axle diameter (commonly 2-3/8″ or 3″), and verify nut tightening guidance.
- Installation and maintenance: Some kits require precise alignment and torque specs; plan for inspection after the first few trips and periodic checks thereafter.
- Maintenance considerations: Regularly inspect bushings for wear, check for rust, and replace any worn-out components to maintain proper alignment and ride quality.
- Warranty and support: Consider seller warranties and return policies, especially for heavier-duty kits used in frequent travel or commercial settings.