1990–Current
GMC Sierra 1500
Heavy Duty
Designed to provide additional rear suspension support for Sierra 1500 models used for towing, touring, work and load carrying.
GMC Sierra Suspension Upgrade Guide
Improve stability, load support, ride control and towing confidence with a RoadActive Suspension kit designed for your GMC Sierra. Select your model below to find the correct Heavy Duty or Mega Duty kit.
Why Choose RoadActive Suspension for Your GMC Sierra?
RoadActive Suspension is a mechanical suspension support system designed to reduce rear-end sag, improve towing stability and enhance the handling of GMC Sierra 1500, 2500 and 3500 models fitted with rear leaf springs.
Whether your Sierra is towing a caravan, fifth wheel, horse float, boat trailer or machinery trailer, or carrying a canopy, truck camper, tools or another constant load, RoadActive Suspension works with the existing rear leaf springs to provide additional support when it is needed.
Unlike airbags, RoadActive Suspension requires no compressors, airlines or ongoing pressure adjustments. The system responds automatically as the rear suspension moves, helping the vehicle remain more level, stable and controlled during everyday driving, towing and load carrying.
Benefits of RoadActive Suspension for GMC Sierra
Improved Load Support
Helps reduce rear-end sag when carrying tools, canopies, truck campers and other constant or variable loads.
Greater Towing Stability
Helps improve vehicle control and driver confidence when towing caravans, fifth wheels, horse floats and work trailers.
Automatic Mechanical Support
Works with the existing rear leaf springs without compressors, airlines or regular pressure adjustments.
Built for Towing, Touring and Heavy Load Applications
GMC Sierra owners commonly use their vehicles for demanding towing and load-carrying applications. RoadActive Suspension provides progressive rear suspension support without replacing the original leaf springs, helping retain controlled suspension movement while improving stability under load.
Caravan Towing
Fifth-Wheel Towing
Horse Floats
Boat Trailers
Truck Campers
Canopies
Commercial Loads
Machinery Trailers
Shop RoadActive Suspension Kits by GMC Sierra Model
Select your GMC Sierra model below. Heavy Duty and Mega Duty kits are designed for different load and towing requirements. Always review the individual product fitment information and confirm your rear leaf spring configuration before ordering.
2011–Current
GMC Sierra 2500
Heavy Duty
Suitable for demanding towing, heavier constant loads, canopies and commercial applications.
Mega Duty
Provides the highest level of RoadActive Suspension support available for applicable Sierra 2500 models used in demanding towing and load-carrying applications.
2011–Current
GMC Sierra 3500
Heavy Duty
Designed for applicable Sierra 3500 models fitted with a rear overload spring and used for towing or carrying substantial loads.
This Heavy Duty kit requires the applicable rear overload-spring configuration. Confirm the rear suspension layout before ordering.
Mega Duty
Intended for the most demanding Sierra 3500 applications, including truck campers, heavy fifth wheels and substantial constant loads.
Important GMC Sierra fitment information
Sierra models may use different RoadActive Suspension kits depending on the model, year and rear leaf spring configuration. The Sierra 3500 Heavy Duty kit shown above is for the applicable overload-spring configuration. Do not select a kit based only on the model name or duty rating. Review the individual product fitment details before ordering.
Heavy Duty or Mega Duty?
Heavy Duty
Heavy Duty is designed for demanding towing, heavier constant loads, canopies, work equipment and commercial use. It provides a higher level of rear suspension support while retaining controlled suspension movement.
Mega Duty
Mega Duty provides the highest level of RoadActive Suspension support for applicable Sierra 2500 and 3500 models. It is intended for demanding applications such as truck campers, heavy fifth wheels and substantial constant loads.
GMC Sierra RoadActive Suspension FAQs
Which RoadActive Suspension kit fits my GMC Sierra?
Select your Sierra 1500, 2500 or 3500 model from the guide above and review the product fitment information. The correct kit depends on the model, year, intended use and rear suspension configuration.
Does RoadActive Suspension help reduce rear-end sag?
Yes. RoadActive Suspension works with the existing rear leaf springs to provide additional support when towing or carrying loads, helping the vehicle remain more level and controlled.
Does RoadActive Suspension help with caravan or fifth-wheel towing?
Yes. The system helps control rear suspension movement, reduce sag and improve towing stability when towing caravans, fifth wheels and other heavy trailers.
Do I need Heavy Duty or Mega Duty?
Heavy Duty suits demanding towing and heavier constant loads. Mega Duty is intended for the most demanding applications, including heavy fifth wheels, truck campers and substantial permanent loads.
Does the Sierra 3500 Heavy Duty kit require an overload spring?
The Sierra 3500 Heavy Duty product shown in this guide is for the applicable overload-spring configuration. Confirm the rear leaf spring arrangement before ordering.
Does RoadActive Suspension replace airbags?
RoadActive Suspension provides mechanical suspension support without airlines, compressors or pressure adjustments. Whether it replaces an existing airbag system depends on the vehicle and how it is used.
Is drilling required for installation?
RoadActive Suspension kits are designed as bolt-on leaf spring support systems. Always review the installation instructions supplied with the specific kit before fitting.
Not Sure Which GMC Sierra Kit Fits?
Use Find My Kit to select your GMC Sierra model. If you are unsure whether Heavy Duty or Mega Duty is appropriate, or whether your Sierra 3500 has the required overload-spring configuration, contact our Australian team before ordering.
Find My Kit
