RAS® Mega-Duty — The Strongest Kit We've ever built

Engineered and independantly tested on ¾-ton and 1-ton trucks carrying serious weight — delivering more control, less squat, and better ride quality under load.

Select your vehicle

Most Suspension upgrades weren't build for this

If you're close to maxing out your full-size pickup truck and looking to add a suspension upgrade, be careful. Most suspension upgrades either:

Can't handle the weight

Only reduce squat and create harsh ride

Require constant readjustments

Negatively impact weight distribution

Increase stress on the axle and frame

That's exactly why we built Mega-Duty.

Why we built RAS® Mega-Duty.

Our Heavy Duty kit set the standard for towing and hauling on mid-size and 1/2 ton trucks — but fleets, contractors, and ¾- and 1-ton truck owners kept asking for more.

More control.

More support.


More confidence under extreme loads, with the same great design concept.

Our Mega-Duty kit was built to meet that demand.

Which Kit Is Right for Your Truck?

Choose the level of support that matches how you use your truck.

Heavy Duty Kit

Ideal for ½-ton and light ¾-ton trucks

  • Everyday towing (boats, campers, utility trailers)
  • Occasional heavy loads
  • Trucks needing improved stability and reduced squat
  • Drivers wanting better ride quality and control

Great for most truck owners who tow and haul regularly.

What makes RAS® Mega-Duty different?

  • 30% stronger spring rate
  • Greater load support
  • Improved stability under heavy loads
  • Reduced squat (~2") on 1 ton
  • No air or adjustments
  • Maintains ride quality unloaded

RAS® MEGA-DUTY Explained

RAS® MEGA-DUTY PERFORMANCE VALIDATION

REAL TESTING. REAL RESULTS.

Independent third-party testing conducted on the RAS® Mega-Duty system installed on Chevy 3500 loaded to +99% of maximum payload capacity.
5.8X
Reduction in Suspension Fatigue Damage
Significantly reduces long-term stress and wear compared to stock suspension.
23%
Reduction in Road Vibration Transfer
Less road shock transmitted into the vehicle body and driver seat.
6.5%
Shorter Stopping Distance (37 ft from 60–0 mph)
Improves braking stability under heavy load.
Up to 43%
Improvement in Pitch Stability
Reduces front-to-rear rocking under braking, acceleration, and bumps.
Up to 2"
Reduction in Rear Squat
Maintains proper suspension geometry under load.
200,000 Miles
Durability Testing Completed
Validated under real-world loaded driving conditions.
ONE INSTALL. YEARS OF PERFORMANCE.
Testing performed on the RAS® Mega-Duty system. Performance characteristics may vary by application.

Who Is RAS® Mega-Duty Built for?

Built and tested for real-world use where weight, control, and stability actually matter.

Heavy Towing (RV, Large trailers)

Work trucks / contractors

Fleet Vehicles

Slide-in campers

Hauling Equipment