Long Box vs Short Box and slip hitch for 5th wheel

My first truck for pulling a fifth wheel trailer was a crew cab long box. I'm now on my third shortbox. I've never used a sliding hitch and find the shortbox a bit of an inconvenience but obviously not a real big deal. If I ever get a sliding hitch it will be an automatic one such as the Pullrite Superglide, or I may purchase a Reese Sidewinder....Unless I end up going to a dually at some point I'll be sticking with a 6.75 ft box.