The Rancho RS5000X RS55388 Suspension Shock Absorbers are designed for vehicles that tow, haul or go off-roading. The RS5000X RS55388 has an exclusive valuing system and compressions phase that maintains the handling, braking and steering by providing resistance to changing road conditions. With a large tritube body filled with all-weather fluid, this shock absorber is able to withstand temperature extremes. To improve the longevity of the RS55388 and prevent foaming, nitrogen gas is pressurized to 150 PSI. Backed by a limited lifetime warranty, the Rancho RS5000X shocks provides the premium performance they're known for.