I have a short box 3500 and haul an Arctic Fox 8'6" camper with a slide out on it. It was designed for a short box truck though. If you can, get the dealer to scale the camper for you before you buy it, the tags are usually wrong. I know this form experience, my camper was suspposed to weight in at 3450lbs WET. I scaled it on my second trip after adding bumpstop extensions to keep the truck from sagging, and it scaled at 4900LBS. Heart attack, yes, stuck with the camper, yes. Haven't had any issues with handling or braking, you just have to smart when you're driving.