Demco 8553019 - Custom Mounting Brackets for Demco Hijacker SL Series 5th Wheel Trailer Hitches Chevy Silverado/Sierra 1500 5'6"’ & 6'6" 2020Custom brackets work with Demco SL Series above bed base rails (DM6012 sold separately) to let you install your fifth wheel trailer hitch in the bed of your truck. Hardware included. Installation brackets mount beneath your truck bed to provide attachment points for your 5th wheel rails Base rails (DM6012 sold separately) sit in your truck bed and allow installation of 5th wheel trailer hitch Custom fit brackets mount to existing holes in your