If your small trailer sags, bounces, or just doesn’t ride right, worn leaf springs are likely the culprit. Replacing them restores stability, load support, and peace of mind on the road.
This guide reviews five top-rated leaf springs for small trailers, from direct-fit Dorman replacements to complete suspension kits. We’ll help you choose the right capacity, length, and build for your specific trailer and towing needs.
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Dorman 929-1031 Utility Trailer Leaf Spring – 2000lb Capacity
Brand: Dorman
Best for trailers needing maximum load support from a single spring.
The Dorman 929-1031 is a robust 4-leaf spring designed for trailers needing a 2000lb capacity. With a 26-inch length and 4 1/4-inch arch, it’s built to handle heavier loads while maintaining proper ride height. The eye/eye configuration makes it a straightforward replacement for many utility trailers, and Dorman’s reputation for quality aftermarket parts means you can trust the fit and function.
This spring is an ideal solution if your original springs are damaged from overloading or corrosion. Dorman engineers these to strict specifications, so you get reliable performance and long service life. If your trailer requires a 2000lb capacity per spring and you want a direct, hassle-free swap, this is a solid choice.
- High 2000lb capacity
- Direct replacement fit
- Durable quality materials
- Heavier than lower-capacity springs
- May be overkill for light loads
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- Direct replacement – these leaf springs are designed to match the fit and function of the original leaf springs on specific vehicles or trailers
- Ideal solution – seamlessly replaces leaf springs damaged by overloading, collision, cracking or corrosion, or are due for replacement
- Durable construction – made from quality materials to strict specifications to ensure reliable performance and long service life
- Trustworthy quality – engineered, manufactured and supported by the premier aftermarket leaf spring provider in the USA
- Support available – every Dorman part is backed by Dorman's ASE Blue Seal Certified technical support team
Dorman 929-1002 Utility Trailer Leaf Spring – 1400lb Capacity
Brand: Dorman
Ideal for small trailers needing a reliable, lower-capacity spring.
The Dorman 929-1002 is a 4-leaf spring with a 1400lb capacity, making it a great match for smaller utility trailers. Its 20 1/2-inch length and 3 3/8-inch arch are designed for compact trailers where space is limited. Like all Dorman springs, it’s a direct replacement that matches original specifications, so you can swap it in without modifications.
This spring is perfect for trailers damaged by overloading or corrosion, offering a seamless replacement. The quality construction ensures reliable performance, and Dorman’s engineering support gives you confidence in the product. If you need a lower-capacity spring for a lighter trailer, this is a dependable option that won’t compromise on durability.
- Compact 20.5-inch length
- 1400lb capacity for light loads
- Direct OE replacement
- Not for heavy loads
- Lower arch may limit ground clearance
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- Direct replacement – these leaf springs are designed to match the fit and function of the original leaf springs on specific vehicles or trailers
- Ideal solution – seamlessly replaces leaf springs damaged by overloading, collision, cracking or corrosion, or are due for replacement
- Durable construction – made from quality materials to strict specifications to ensure reliable performance and long service life
- Trustworthy quality – engineered, manufactured and supported by the premier aftermarket leaf spring provider in the USA
- Support available – every Dorman part is backed by Dorman's ASE Blue Seal Certified technical support team
Dorman 929-1029 Utility Trailer Leaf Spring – 1500lb Capacity
Brand: Dorman
Great for trailers needing a balance of capacity and ride quality.
The Dorman 929-1029 offers a 1500lb capacity with a 3-leaf design, striking a balance between load support and ride comfort. At 26 inches long with a 4 1/4-inch arch, it provides similar dimensions to the 4-leaf version but with fewer leaves for a potentially smoother ride. This makes it a good choice for trailers that don’t require the maximum capacity but still need solid support.
This spring is a direct replacement for damaged or worn originals, built from quality materials for long service life. Dorman’s engineering ensures it matches the fit and function of the original, so installation is straightforward. If you want a slightly softer ride without sacrificing too much capacity, this 3-leaf spring is worth considering.
- 1500lb capacity
- 3-leaf design for comfort
- Direct replacement fit
- Less capacity than 4-leaf version
- May not suit heavy loads
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- Direct replacement – these leaf springs are designed to match the fit and function of the original leaf springs on specific vehicles or trailers
- Ideal solution – seamlessly replaces leaf springs damaged by overloading, collision, cracking or corrosion, or are due for replacement
- Durable construction – made from quality materials to strict specifications to ensure reliable performance and long service life
- Trustworthy quality – engineered, manufactured and supported by the premier aftermarket leaf spring provider in the USA
- Support available – every Dorman part is backed by Dorman's ASE Blue Seal Certified technical support team
SEHNSUCHT 4-Leaf Trailer Leaf Spring Kit – 3500lb Axle Kit
The SEHNSUCHT SW4B replacement kit includes two 4-leaf springs, each with a 1750lb capacity, totaling 3500lbs for a tandem axle setup. The springs measure 25 1/4 inches eye-to-eye with a 3-inch free arch, and the kit comes with U-bolts, tie plates, hangers, and equalizers. This all-in-one solution simplifies installation for standard 3500lb trailer axles.
Made from heavy-duty carbon steel with an anti-rust coating, these springs are built for durability and corrosion resistance. The kit replaces the SW4B part number and is designed for round axles. If you’re rebuilding a tandem axle trailer suspension, this comprehensive kit provides everything you need for a reliable upgrade.
- Complete kit with hardware
- 1750lb per spring capacity
- Anti-rust coating
- Only fits round axles
- Installation requires some mechanical skill
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- About The Springs: Each spring offer 1,750lbs capacity, suit for standard 3,500lbs trailer axle. Eye to Eye length: 25-1/4 inch, Free open: 3 inch, width of leaf: 1-3/4 inch, 4 leaves, 9/16 inch bushing dia, 2 Bushings Installed for Each Spring, Leaf Thickness 5/16 inch. NOTE: The nut should be tightened horizontally. Failure to do so will affect the final user experience.
- About The Replacement: It will replace for SW4B. The Leaf Springs Made of Heavy Duty Carbon Steel for transmission stability and friction damping, Extra added anti-rust coating for corrosion resistance and long-lasting performance.
- About The Axle U-bolt Kit: This kit include 4 x 5-1/2" long U bolts, U-bolt thread diameter is 1/2",the curvature (inside diameter) of the U-bolt is 2 4/9"; 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. And this kit used for 2-3/8" dia round trailer axles.(This product offer 2* U-bolt kit).
- About The Trailer Axle Hanger Kit: This kit include 2 x EQ-E1 equalizers, 6 x 3" tall hangers, 8 x shackle straps, 14 x 9/16"-18 x 3" long shackle bolts and locknuts. And this kit used for 1-3/4" leaf springs.
- After-sales service: Any questions after receiving, please contact us freely. Thanks for choosing us!
AEagle 4-Leaf 1750lb Capacity Spring Kit – Replaces SW4B
The AEagle 4-leaf spring kit offers a 1750lb capacity per spring, suitable for 3500lb trailer axles. Each spring is 25 1/4 inches long with a 3-inch free arch and 1.75-inch width. The kit includes U-bolts, tie plates, and hangers for a complete installation, replacing the SW4B part number for round axles only.
These springs feature an anti-rust coating for corrosion resistance, and AEagle uses high-quality raw materials for strength. The double-eye design ensures secure mounting. If you need a reliable replacement for your tandem axle trailer, this kit provides all necessary components for a straightforward swap.
- Complete suspension kit
- 1750lb per spring capacity
- Anti-rust coating
- Not for square axles
- U-bolts may need trimming for some axles
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- Replaces for Part Number: SW4B,not fit square axle,Only fit round axle.
- Includes: 2 x 4-Leaves Double Eyes Springs; 3,500lbs axle U-bolt kit for 2-3/8" dia round trailer axles. Kit includes: 4 x 5-1/2" long U bolts, U bolts dia. 1/2", 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. Complete single trailer axle hanger kit for 1-3/4" leaf springs, Kit includes: 2 x 3" tall hangers, 2 x 2.1" tall hangers, 4 x shackle straps (eye to eye 3.09"), 6 x 9/16"-18 x 3" long shackle bolts and locknuts
- Parameters: 1,750 lb capacity per spring for 3,500 lbs trailers; eye to eye length: 25-1/4 inch, free open: 3 inch, width of leaf: 1-3/4 inch, 4 leaves, 9/16 inch bushing dia, 2 bushings installed for each spring, leaf thickness: 5/16 inch.（Note: The nut should be tightened horizontally. Failure to do so will affect the final user experience）
- Durability: Each of AEAGLE trailer leaf spring kit with anti-rust coating for good corrosion resistance. We always choose raw material with high quality to make our products strong, durable and ensure reliable performance and long use time.
- Quality Assurance: 12-month warranty! Tested before shipping.
Buyer’s Guide: What to Consider
Choosing the right leaf spring involves matching capacity, dimensions, and hardware to your trailer. Here are five key factors to consider.
- Capacity: Match the spring's load rating to your trailer's gross axle weight rating (GAWR). Overloading can cause failure, while underloading may result in a harsh ride.
- Length and Arch: Measure eye-to-eye length and free arch to ensure proper ride height and suspension geometry. Incorrect dimensions can affect handling and tire clearance.
- Leaf Count: More leaves generally mean higher capacity but a stiffer ride. Fewer leaves offer more comfort but lower load support. Choose based on your typical load.
- Eye Type: Common types are eye/eye and eye/sling. Ensure the spring's end configuration matches your trailer's mounting points for a direct fit.
- Hardware Included: Some kits include U-bolts, plates, and hangers, saving you time and ensuring compatibility. Check what's included to avoid extra purchases.
Conclusion
Selecting the right leaf spring for your small trailer depends on your load requirements and axle setup. Dorman springs offer direct-fit options for various capacities, while SEHNSUCHT and AEagle provide complete kits for tandem axle rebuilds.
For heavy loads, the Dorman 929-1031 is a top pick. For a full suspension overhaul, the SEHNSUCHT kit delivers great value. Always verify your trailer’s specifications before purchasing.