This is the steepest angle a vehicle can climb or descend before any part of the body, bumpers or any equipment mounted on the vehicle makes contact with the ground. Lift kits can be installed to improve your vehicle’s approach angle.This is your suspensions capacity to droop on one axle over terrain that is uneven. Your axle should work at extreme levels to navigate uneven ground while keeping the body of your vehicle need 12v air compressor. If not, it feels as though you are driving a roller coaster.