Timbren Industries ASR2KHDS04 Heavy-Duty Axle-Less Trailer Suspension with 4-Inch Lift Spindle - 2,000 lbs

The Timbren Industries ASR2KHDS04 is a heavy-duty axle-less trailer suspension system engineered for both off-road and on-road use, delivering a 2,000 lb per-side load capacity with an integrated 4-inch lift spindle for exceptional ground clearance. Designed specifically for demanding applications including overlanding, hunting, camping, and utility hauling, this system eliminates the traditional through-axle entirely — removing a common obstacle for low-clearance terrain while providing an independent, fully functioning trailer suspension.

At the core of this system is Timbren's proprietary Aeon® rubber spring technology. The progressive-rate main springs absorb road shock and automatically stiffen as load increases, delivering a smooth and stable ride whether the trailer is empty or fully loaded. A secondary rebound spring maintains constant tension on the suspension arm at all times, eliminating trailer rattle, bounce, and bottoming out during unloaded operation.

Key Features:

• 2,000 lb load capacity per side — heavy-duty outboard arm construction supports increased off-road demands
• 4-inch lift spindle — raises deck height for significantly improved ground clearance
• Axle-less independent suspension — each side moves independently for maximum control over rough terrain
• Aeon® progressive-rate rubber springs — compress and stiffen with load for a smooth, self-adjusting ride
• Rebound springs — maintain constant arm pressure to prevent rattle and bounce when unloaded
• Built-in camber and toe-in — promotes straight trailer tracking and reduces tire wear
• E-Z Lube spindles — standard size spindle designed for regular highway tires (235/85R16 or smaller)
• 4-bolt brake flange — brake-ready design compatible with standard 10-inch brake assemblies
• Heavy-gauge steel construction — powder-coated mounting brackets for corrosion resistance and long-term durability
• Bolt-on installation — no welding required; compatible with aluminum trailer frames
• Fits any trailer frame width — adjustable outboard arm design accommodates various trailer configurations
• Shims included — allows fine adjustment of suspension alignment and camber specific to your trailer frame
• 3-year limited warranty

What's Included: Left and right 4-inch lift spindles, mounting brackets, bushings, and all required hardware. Hubs are not included — see available hub and brake accessories separately.

Note: This axle-less system requires crossbeam support. If your trailer frame lacks a crossmember, a 2" x 2" steel tube can be run through the square holes on the mounting brackets to provide the necessary support. Optimal performance is achieved when the average operating load falls between 60–80% of the rated 2,000 lb capacity. Compatible with standard highway tires up to 235/85R16. For wider or off-road tires, see Timbren ASR2KHDS03 (long spindle) or ASR1THDS03.