F-143K2 Mount - Fits: Freightliner XC chassis with a tie rod diameter of 1-1/2in RV Steering Stabilizer - Reduces road wandering, over-steering, and driver fatigue caused by side winds, passing semi-trucks, crowned roads, bad roads, and rut tracking. Limited lifetime vehicle warranty RV Steering Control - Helps improve RV driving safety in the event of front tire blowouts, road shoulder drop off, passing traffic, potholes, pavement drops, and other bad road conditions. Truck Steering Stabilizer - Helps protect the safety of the vehicle and drivers while reducing maintenance costs and tire wear. Safe-T-Plus units available for all Class 1 - 8 trucks. Please refer to the “Safe-T-Plus Fit Guide” document to determine the correct steering stabilizer and mounting kit for your specific vehicle. Steering stabilizer unit not included.