My Ford extended cab short bed is 19.5' and 22' with the Arctic Fox 811 on it. This is measuring from the front tow hooks to the truck rear bumper or camper generator exhaust which are the most extreme points on either end. Just for reference, the F250 cab sits at 6'9" unloaded and 1" lower with Camper at stock suspension height running 245/70R19.5 tires.
Host Mammoth 11.5 on Ram 5500 HD