Looking for a cargo trailer axle kit that fits your needs and is easy to install? This guide highlights five top options that cover common cargo trailer sizes and loads. Each product is selected for durability, compatibility, and clear installation details. Best for DIY upgrades, RVers, boat trailers, and light commercial use.
| Product | Best For |
|---|---|
| RV MURTS 61″ Hubface / 46″ Spring Center (3500 lbs) | Medium-duty cargo trailers needing 5-on-4.5″ hubs |
| RV MURTS 73″ Hubface / 58″ Spring Center (3500 lbs) | Longer wheelbase cargo trailers with higher clearance |
| dreamdragon Tandem Trailer Axle Suspension Kit – 3,500 lbs | Dual-axle setups requiring four-leaf springs |
| dreamdragon Drop Axle Kit with Hubs (85″-Hubface) | Drop-axle configurations for lower ride height |
| 3500 lb Light Duty Single Trailer Axle Kit (61″ Hubface) | Simple, single-axle replacements on smaller cargo trailers |
Note: Each product supports standard 5-on-4.5″ bolt patterns and typical leaf-spring suspensions. Choose based on hubface distance, spring center, and whether you need a single or tandem axle setup.
RV MURTS 61″ Hubface 3500 lb Axle Kit
Best for mid-size cargo trailers using 5-bolt on 4.5″ hubs. Includes a 3500 lb axle with a 61″ hubface and 46″ spring center, plus a full spring and hardware kit (U-bolt, hanger, shackle). The kit is designed to provide solid wheel support and shock absorption for RVs and campers. The leaf springs measure 25-1/4″ eye-to-eye with 4 leaves and a 9/16″ bushing diameter.
Who it’s for: DIY installers upgrading a trailer with standard 3500 lb capacity and 61″ hubface. Why selected: clear compatibility data, complete hardware, and proven steel construction. Caution: verify that your current axle length and hub pattern match before purchase.
RV MURTS 73″ Hubface 3500 lb Axle Kit
Best for longer trailers needing 73″ hubface and 58″ spring center. This kit includes a 3,500 lb axle with 5-bolt 4.5″ pattern and a tandem-ready leaf spring setup. It emphasizes a robust steel frame and a compatible spring center of 58″. The measurement references align with standard trailer configurations for better load distribution.
Who it’s for: trailers with extended wheelbases and heavier cargo. Why selected: longer hubface improves stability for heavier loads. Caution: confirm the 18″-maximum spring-center specification and ensure your mounting is compatible with the extended hubface before ordering.
dreamdragon Tandem Trailer Axle Suspension Kit – 3,500 lbs
Best for complete tandem setups with four-leaf springs. The kit includes two leaf springs rated for 1,750 lbs each, plus U-bolts, tie plates, and nuts to suit a 2-3/8″ round axle. Eye-to-eye length is 25-1/4″, with 3″ free open height and 1-3/4″ leaf width. Suitable for light- to medium-duty trailers requiring reliable suspension and straightforward installation.
Who it’s for: users upgrading tandem axles seeking balanced load support. Why selected: complete spring-and-hardware package with a standard eye-to-eye and a familiar bolt pattern. Caution: ensure your trailer uses a 2-3/8″ round axle with compatible mounting hardware.
TRAILER SUPPLIES Leaf Spring and U-Bolt Kit – 2,000 lb Axles
Best for upgrading light- to medium-duty trailers with 2,000 lb axles. This kit includes two 24-5/8″ four-leaf slippers and a 2,000 lb U-bolt mounting kit. It fits many major brand axles and provides a direct OEM replacement option for Dexter, Lippert, and AL-KO systems. The kit is ideal when you need stronger springs without changing the entire axle assembly.
Who it’s for: owners of utility boats and cargo trailers requiring improved suspension on a 2,000 lb axle. Why selected: compatibility with common brands and a bundled U-bolt kit. Caution: verify the axle rating and bolt pattern before purchasing.
3500 lb Light Duty Single Axle Kit (61″ Hubface)
Best for straightforward single-axle replacements on smaller cargo trailers. Features a 61″ hubface and 46″ spring center with 5×4.5″ bolt pattern. Includes a 3,500 lb idler axle, two 25.25″ four-leaf springs, U-bolt kits, a double-eye hanger, and pre-packaged components for proper fitment. This kit uses OEM-grade construction for reliability.
Who it’s for: owners replacing a single-axle setup on smaller trailers. Why selected: complete pre-packaged components designed for a simple, accurate replacement. Caution: confirm the hubface and spring-center measurements match your trailer’s existing hardware.
Buying Guide
What is my trailer’s axle capacity and pattern?
Verify your trailer’s gross axle weight rating (GAWR) and the bolt pattern (commonly 5-on-4.5″). Choosing a kit with matching capacity and bolt pattern ensures compatibility and safe operation.
Should I choose single or tandem axles?
Single-axle kits are suitable for smaller trailers with lighter loads. Tandem kits provide improved stability for longer or heavier trailers and better weight distribution.
What hubface and spring center do I need?
Hubface distance and spring center affect mounting geometry and wheel alignment. Measure your current setup and compare with kit specifications (e.g., 61″ hubface / 46″ spring center or 73″ hubface / 58″ spring center) to avoid mismatches.
What components are included and what might I need separately?
Many kits include axles, springs, U-bolts, hangers, and shackles. Some require additional hardware or adapters. Check the included items and plan for extra parts if needed for a complete installation.
How easy is installation and alignment?
Kits labeled as OEM-grade and complete with hardware tend to simplify installation. Proper alignment reduces tire wear and improves handling. If unsure, consult a professional installer.
Durability and weather resistance
Leaf springs and axles with corrosion-resistant coatings perform better in outdoor environments. Consider rust protection when selecting a kit for frequent exposure to moisture or road salt.
Frequently Asked Questions
- Q: Are these kits compatible with drum brakes? A: Many kits are designed for drum-brake hubs, but always verify hub compatibility with your braking system.
- Q: Can I reuse old mounting hardware? A: It’s generally safer to use the included hardware or new components to ensure secure installation.
- Q: How do I ensure the right spring count? A: Count or confirm the leaf spring configuration; four-leaf springs are common for 3,500 lb axles.
- Q: Do these kits fit boat trailers? A: Yes, several kits are suitable for boat and utility trailers within the specified capacity.
- Q: Is a drop-axle kit necessary for low clearance trailers? A: A drop-axle can reduce ride height and improve loading, but confirm compatibility with your trailer frame.