Reinforced main springs or heavy duty springs are the best solution if the suspension system has to carry a constant heavy load. Particularly suitable for vehicles that are always heavily loaded or often driven off-road.The vehicle remains easy controllable and the modified suspension makes it possible to drive comfortably and safely even in these conditions. These springs are stronger and replace the existing springs. Reinforced main springs always replace the springs on the rear axle only.If you want more ground clearance for both the front and rear springs, choose lift springs.