If your truck had a hitch already then you will need a rail kit and the hitch of your choice. I went with the B&W companion fifth wheel hitch because I wanted the bed clear when the hitch is removed. See turnoverball.com. My hitch is set for the 4" behind the axle setting due to the rounded front cap (88 degree) on my Keystone Alpine. If your 5er has a flat square cap then you should consider a slider. My bed is 6' 4" on a Ram 3500 4x4 megacab and have had no problems for over 10k miles towing. Towing a 5er is easier than a TT IMHO because pivot is at the axle not the rear bumper.