The right travel trailer leaf springs must match your axle rating, spring dimensions, and mounting hardware. For a 3,500-pound axle, the AEagle kit offers springs and tandem hardware, while the Youxmoto and SEHNSUCHT kits cover a single axle. For a 5,200- to 6,000-pound axle, the SEHNSUCHT five-leaf kit is the relevant option. The FWN springs are listed at 2,500 pounds each, but their fit details are limited, so verify dimensions before ordering.
| Product | Best suited for | Key listed detail |
|---|---|---|
| SEHNSUCHT five-leaf kit | Higher-capacity tandem axle setups | 3,000-pound capacity per spring |
| AEagle four-leaf kit | 3,500-pound tandem axle setups | Includes tandem hanger hardware |
| Youxmoto single-axle kit | 3,500-pound round axle | Pair of 1,750-pound springs |
| FWN four-leaf springs | Buyers seeking 2,500-pound springs | High-strength manganese steel listed |
| SEHNSUCHT SW4B kit | 3,500-pound single axle | Includes U-bolts and tie plates |
SEHNSUCHT Five-Leaf Tandem Axle Kit
This kit is best for a tandem trailer setup with standard 5,200- to 6,000-pound axles. Each spring is rated for 3,000 pounds and has five leaves, a 25-1/4-inch eye-to-eye length, 1-3/4-inch width, and 9/16-inch bushing diameter. The listing says the springs replace SW5.
The package includes four 7-inch U-bolts, tie plates, and nuts for a 3-inch-diameter round axle. Its heavy-duty carbon steel construction and anti-rust coating are listed features. Choose it when the axle and spring measurements match; avoid assuming it fits another axle diameter. The manufacturer notes that nuts should be tightened horizontally.
AEagle 3,500-Pound Tandem Suspension Kit
Choose this AEagle kit for a 3,500-pound tandem setup when a complete spring and hanger package is useful. It includes four double-eye springs rated at 1,750 pounds each, plus equalizers, hangers, shackle straps, bolts, and locknuts. The springs measure 25-1/4 inches eye to eye and 1-3/4 inches wide, with four leaves and 9/16-inch bushings.
The included U-bolt kit is specified for a 2-3/8-inch-diameter round axle. The listing explicitly says it does not fit a square axle. Confirm axle type and spring dimensions before purchase, and follow the instruction to tighten nuts horizontally.
Youxmoto Single-Axle Spring Kit
This is best for a 3,500-pound single trailer axle with a 2-3/8-inch-diameter round beam. The kit includes a pair of four-leaf double-eye springs, each rated at 1,750 pounds, along with four U-bolts, tie plates, and nuts. Spring dimensions are 25-1/4 inches long, 1-3/4 inches wide, and 9/16-inch eye inside diameter.
The listing identifies the springs as replacements for SW4B. Its axle limitation is important: the kit is specified for a round axle, not a square one. Check that the axle diameter and mounting measurements match, and tighten the nuts horizontally as directed.
FWN Four-Leaf Trailer Springs
These FWN springs may suit buyers looking for a 2,500-pound-rated spring with four leaves. The listing gives a 25-1/4-inch length, 1.75-inch width, and 3-inch arch. It describes high-strength, high-toughness manganese steel, nylon coils, and an anti-rust coating, and says the spring is designed to absorb road vibration.
The supplied details do not specify axle type, eye dimensions, or included mounting hardware. Verify those measurements and whether the stated 2,500-pound capacity is appropriate for the intended setup before choosing these over a more fully specified kit.
SEHNSUCHT SW4B Single-Axle Kit
This kit is best for a 3,500-pound single axle when replacement springs and axle hardware are needed together. Each four-leaf spring is rated at 1,750 pounds and measures 25-1/4 inches eye to eye, 1-3/4 inches wide, with a 9/16-inch bushing diameter. The listing says it replaces SW4B and specifies heavy-duty carbon steel with an anti-rust coating.
Four 5-1/2-inch U-bolts, tie plates, and nuts are included for a 2-3/8-inch-diameter round axle. This is not a universal axle kit; check axle diameter and spring measurements first. Horizontal nut tightening is specified in the product details.
Buying Guide: How to Choose Travel Trailer Leaf Springs
What spring capacity should you choose?
Match the spring rating to the trailer’s axle and suspension configuration. The listed 1,750-pound springs are paired with 3,500-pound axle applications, while the five-leaf option lists 3,000 pounds per spring for standard 5,200- to 6,000-pound axles. Do not select a spring based on leaf count alone; compare the stated capacity and your trailer’s specifications.
Which measurements should you check?
Measure the old spring eye to eye, spring width, bushing diameter, and arch when applicable. Also identify the axle’s shape and diameter. The kits here specify round axles, and their U-bolts are sized for particular axle diameters. Differences in any of these details can prevent a proper fit.
Do you need a full suspension kit?
A spring-only option may be appropriate when existing hardware is being reused and is suitable. A kit with U-bolts, tie plates, hangers, or equalizers can provide more replacement components, but confirm exactly what is included. The AEagle package includes tandem hanger components; the single-axle options include more limited hardware.
Frequently Asked Questions
Can I use any 25-1/4-inch leaf spring as a replacement?
No. Length is only one fit factor. Check capacity, width, bushing size, axle type, arch, and mounting hardware as well.
What does a spring’s listed capacity mean?
It is the capacity stated for that spring. Compare the product’s rating with the intended axle setup and follow the trailer or axle manufacturer’s requirements.
Are these kits suitable for square axles?
Not all are. The AEagle listing specifically excludes square axles, and the other kits also describe round-axle applications. Verify fit before ordering.
Why do the product listings mention horizontal nut tightening?
Several listings state that the nuts should be tightened horizontally and warn that incorrect tightening can affect use. Follow the supplied product instructions during installation.