X2 what old biscuit said. I have a 2010 Ram 3500 SRW 4x4 megacab 6'4" bed towing a 2014 Keystone Alpine 3500RE with rounded corners (88 degree they call it) and a B&W companion with sideplates bolted for 4" behind axle center and have not needed a slider in over 10 k miles towing. I keep watching but not really close the way I back and maneuver. Just sayin....