My gas 250 has 3100# cargo capacity. CCSB.
Diesel f250 has 1900# cargo capacity.
Gas 350 is often around 4000#.
Diesel 350 is 3200# or less.
Diesels are fat pig engines. Every pound counts with slide ins. Even if you add springs to a F350 level, now you have to pay attention to tires. And some tires, Goodyear for example, can't handle the weight ratings they say they can. I recommend you stay under 10,000 pounds total for a single wheel truck to maintain confident handling, and decent off road tire selection.
So for campers over 3000#'s, I'd get a DRW. And try to stay off the overload springs unless you want to rattle the camper to bits. Beware the online calculators, every brand rigs those #'s with a freak light truck.
Option packs, bigger tanks, dual batteries and such will quickly eat up your GVWR as well. Small hardside campers with no extra width or rear overhang, are about 2000#. Expect 1000# for 2 people and cargo.
Diesel 250's aren't well suited to slide in campers. We are getting hit for being over sticker. Especially georgia's fair and professonal highway patrol. 150's with 5'ers are their preferred victims.
Some years, the Ford 250's were identical to 350's except for a 2"rear block instead of a 4", and of course, the door sticker.
