B&W Companion 5th Wheel Hitch

Best with a long box is all the way forward but if clearance with the tailgate down is an issue, just remove the hitch head and rotate your hitch 180 degrees in the pucks. Reinstall the head and you'll be in the all the way back position. I find with my short box that all the way back is fine .... I can't notice any difference in how the truck handles going down the highway and I like having the added cab to trailer clearance.