The right leaf springs for a trailer depend on eye-to-eye length, width, spring style, and load capacity—not just the phrase “long travel.” The products below range from 20.5 to 26 inches in listed length, but none provides a stated suspension-travel measurement. The 26-inch FWN spring is the longest listed option; the Dorman is best for a shorter eye-to-eye replacement, while the SEHNSUCHT and Aeagle pairs suit buyers matching a 25.25-inch double-eye spring setup.
| Product | Listed length | Capacity | Best for |
|---|---|---|---|
| FWN 4-Leaf Spring | 26 inches | 2,000 lb each | Longest listed spring |
| Dorman 929-1002 | 20.5 inches | 1,400 lb | Shorter replacement fit |
| SEHNSUCHT Double-Eye Pair | 25.25 inches | 1,750 lb each | Pair replacement for matching setup |
| FWN-178 Radius-End Spring | 24.6 inches | 750 lb each | Light-duty trailer applications |
| Aeagle Double-Eye Pair | 25.25 inches | 1,750 lb each | Matching SW4B-style specification |
FWN 26-Inch 4-Leaf Trailer Spring
This is the longest listed spring in this selection, at 26 inches, with a 1.75-inch width, 4.25-inch arch, and stated 2,000-pound capacity per spring. Its high-strength manganese steel construction and added anti-rust coating are intended to support durability, while the product description says the spring absorbs road vibration.
Best for: Buyers whose existing spring measures 26 inches and who need a higher-capacity option than the light-duty models here. It was selected for its length and clearly stated per-spring rating. Caution: The listing does not specify a suspension-travel figure or detailed mounting style, so verify eye configuration and all dimensions before ordering.
Dorman 20.5-Inch Utility Trailer Spring
The Dorman 929-1002 is an eye-to-eye, four-leaf spring with a 20.5-inch length, 1.75-inch width, 3.375-inch arch, and 1,400-pound capacity. Dorman describes it as a direct replacement for specific vehicles or trailers and identifies damage from overloading, collision, cracking, or corrosion as reasons for replacement.
Best for: Owners replacing a matching shorter spring who can confirm the original dimensions and application. Its replacement-focused description makes it a useful choice when fit is the priority. Caution: The listing refers to specific applications; do not assume it fits every utility trailer based on length alone.
SEHNSUCHT 25.25-Inch Double-Eye Pair
This two-piece set has four leaves per spring, a 25.25-inch eye-to-eye length, 1.75-inch width, 3-inch free opening, and 1,750-pound capacity per spring. The listing specifies 9/16-inch bushings, two installed per spring, and a 5/16-inch leaf thickness. It is described as a replacement for SW4B and as suitable for a standard 3,500-pound trailer axle.
Best for: Buyers replacing a pair of springs with matching SW4B dimensions and a compatible axle setup. Heavy-duty carbon steel and an added anti-rust coating are listed features. Caution: Verify axle and mounting dimensions; the stated capacity is per spring, not the trailer’s full payload allowance.
FWN-178 24.6-Inch Radius-End Spring
The FWN-178 is a three-leaf spring measuring 24.6 inches long and 1.75 inches wide, with a 4-inch arch. Its stated capacity is 750 pounds per spring. The manufacturer describes it for light-duty uses such as single-axle utility trailers, boat trailers, and cargo haulers. Listed construction features include manganese steel, nylon coils, and an anti-rust coating.
Best for: A buyer matching a radius-end spring for a light-duty application and prioritizing the listed dimensions over a high load rating. Caution: Its 750-pound per-spring capacity is substantially lower than the other options here, so avoid it when the required rating exceeds that figure.
Aeagle 25.25-Inch Double-Eye Pair
This pair includes two four-leaf double-eye springs, each rated for 1,750 pounds. Listed measurements are 25.25 inches eye-to-eye, 1.75 inches wide, and 3 inches free opening. Each spring has two installed bushings with a 9/16-inch diameter, and the listing identifies SW4B as the replacement part number.
Best for: Buyers seeking a pair with the stated SW4B dimensions and rating. Its measurements closely match the SEHNSUCHT pair, making those products easier to compare on listed specifications. Caution: The listing says it fits round axles only and does not fit square axles. Confirm axle type before purchase.
Buying Guide: How to Choose Trailer Leaf Springs
Does a longer spring mean more suspension travel?
Not necessarily. Overall or eye-to-eye length is a dimension, while suspension travel describes how far the suspension can move. These listings provide spring lengths and some arch measurements, but they do not state a suspension-travel range. Compare the replacement spring with the original and inspect the complete suspension layout before treating length as a travel specification.
Which measurements should you compare?
Measure the old spring in the same condition and between the same points used in the product listing. Check eye-to-eye length, width, arch, leaf count, end style, bushing diameter, and mounting arrangement. Double-eye and radius-end springs are not interchangeable simply because their lengths are similar. Also confirm whether a product is sold as one spring or a pair.
How should you interpret load capacity?
Compare the listed rating with the trailer manufacturer’s specifications and the capacity required for the axle and suspension. Several listings state capacity per spring; a pair’s combined spring rating does not automatically determine safe trailer payload. Tires, axle, frame, and other components also affect the overall limit. Do not select a spring solely because its rating is higher.
What should you check before ordering?
- Match the original spring’s dimensions and mounting style.
- Confirm axle type and any stated replacement part number.
- Check whether the advertised quantity is one spring or two.
- Verify the required capacity for the intended trailer application.
- Inspect bushings and mounting hardware requirements for your setup.
Frequently Asked Questions
What is the longest spring listed here?
The FWN four-leaf spring is listed at 26 inches long. Its listing does not provide a suspension-travel measurement.
Are the SEHNSUCHT and Aeagle springs the same size?
Both list a 25.25-inch eye-to-eye length, 1.75-inch width, 3-inch free opening, and 1,750-pound capacity per spring. Confirm the rest of the fit requirements and axle type before choosing.
Can I replace a single leaf spring with a higher-capacity model?
Do not assume that a higher rating is an appropriate upgrade. Match the trailer’s specified spring setup and confirm that the axle and other suspension components are suitable.
Does the Aeagle pair fit a square axle?
No. Its listing states that it fits round axles only and does not fit square axles.
Which option is intended for light-duty trailers?
The FWN-178 listing identifies light-duty utility, boat, and cargo trailer applications and gives a capacity of 750 pounds per spring.