Originally Posted by MtnTrek
Yes you'd need to cut away the mat for the rails. The rails require direct contact to the under-bed frame mounted brackets. Be sure the correct spacers / shims are all in place that sandwich the bracket, bed sheet metal, to the rails.
Mule: 2016 RAM Mega Cab Dually 6X6, RAM Puck w/ Demco Hijacker 21K Autoslide, Laramie, 6.7, Aisin, 4.10's, Loaded.
Wagon: 2015 Jayco Pinnacle 38FLSA, Sailun G's, Center Point Air Ride, 572 watts Solar.