The easiest way to back a 5th wheel is to look where you want the tires to go, and have a safty person to watch the rear of the trailer. I've even heard of people who laid out their extension cord along the path they want their wheels to go.
Elliott, Vicky, and Sadie, our GSD
2014 Redwood36RE Titan Disc brakes, 17.5 " Sailun Tires
2013 RAM dually, CTD, Aisin Tranny, CC, LB 4x4