Suspension Enhancement to Lengthen the Life of My Leaf Springs
Updated 01/07/2026 | Published 01/05/2026
Products Featured in This Question
Question:
I have a tandem axle RV travel trailer that has 3500 lb axles. The current leaf springs DEXTER Vendor Part 072-042-00 are now flat and need replacement. I would like to upgrade them to heavier weight rating leaf springs in hopes to prevent flattening in the near future understadnign that heavier leaf springs will not increase the RV GVWR. Is there a products thats recommended as replacements?
asked by: Juan P
Expert Reply:
Hey Juan,
I recommend getting the Dexter 4-Leaf Double-Eye Spring # DX23CR like you currently have but adding SumoSprings Trailer Helper Springs - Overslung # TSS-107-40 to your system. Install is easy and they don't require any tubing or air pressure management. Adding leaf springs rated for higher than your axle capacity is going to give you a stiff ride, while the SumoSprings will make your whole suspension system last longer and give you a smoother ride.
If your leaf springs are underslung, then you'll want the SumoSprings Trailer Helper Springs - Underslung # TSS-106-40.
To determine which setup you have: overslung means the axle is mounted below the leaf springs, underslung means the axle is mounted above the leaf springs.
Do you need to replace your U-bolts as well?
Product Page this Question was Asked From
4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/4" Long
- Trailer Leaf Springs
- Double Eye Springs
- 9/16 Inch Eye
- Nylon Bushings
- 3500 lbs
- 1-3/4 Inch Wide
- 4 Leaf
- 25-1/4 Inch Long
- Standard Grade
- Dexter
more information >
Continue Researching
- Shop: 4-Leaf Double-Eye Spring for 5,000-lb Trailer Axles - 25-1/4" Long
- Video: Lippert Bolt-On Shock Kit w/ Heavy Duty Gas Shocks Review
- Search Results: trailer suspension parts
- Search Results: trailer axles
- Shop: 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles - 25-1/4" Long
- Shop: CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc
- Shop: 4-Leaf Double-Eye Spring for 5,000-lb Trailer Axles - 25-1/4" Long
- Shop: 4-Leaf Double-Eye Spring for 4,400-lb Trailer Axles - 25-1/4" Long
- Q&A: Can 5,000 lb Leaf Spring be Used on 3,500 lb Axle
- Shop: 4-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 25-1/8" Long
- Shop: Shackle Bolt with Locknut for Double-Eye Springs - 3" Long
- Q&A: Why Would Camper with New Springs Still Lean to One Side
- Q&A: Trailer Leaf Springs Feel Too Bouncy On Single Axle Trailer
- Q&A: Potential Causes for Sagging Leaf Spring on Passenger Side of 5th Wheel Trailer with Slideouts
- Q&A: Can I Upgrade My 3,500 lb Leaf Springs To 5,000 lb Springs If The Measurements Match?
- Q&A: Recommended Leaf Springs, Shackle Kit, and Wet Bolts for a Trailer w/ 4,400 lbs Axles
- Q&A: Is it Ok to Replace Factory Leaf Springs With a Higher Capacity Option?
Juan P.
1/7/2026
Thanks for the input. Regarding the u bolts, are they recommended to be replaced (along with any other suspension components) when replacing leaf springs? Said differently, are any components 1 time use after being torqued?