Looking at 2016 F250 XLT crew cab short bed trucks,gas model shows 2755 payload on door and diesel shows 2122 lbs with a option on it called camper pkg- upgraded front & rear springs and stabilizer ba...
The diesel engine weighs much more than the gas engine. F250 has a GVW of 10,000 if you move up to a 350 you can order one with a GVW of up to 11,500 so you could increase your capasity by 1500 lbs.