I have an Artic Fox 865 on a 2011 F-250. With heavy duty suspension and camper package(both options)it is an F-350 in underneath. You may as well buy an F-350 it is only about 300 bucks more. Off-Road package will get you sway bars and slightly better shocks. Torklift makes upper Stableloads and I'd get airbags as well. While you may be able to get away without airbags, they are well worth the $400 bucks for the kit.
I looked at a lot of campers and quality of the Palamino was lacking when compared to Arctic Fox, Lance or Adventurer. I'm pretty sure all campers are heavier than the sticker. I see plenty of campers on 3//4 ton series trucks with zero problems. That being said, The tiny expense of buying a one ton makes it a no brainer.
So what is the real advantage of an F-350 badge? It nets you almost a ton more GVWR over the F-250 with only a different wheel and tire combination (maybe). This is important if you are planning on driving over the scales constantly. Ford actually markets a 10,000LB GVWR F-350 for people who live in states where anything over 10K is a commercial truck or some such weirdness. The only thing they change is the door sticker.
Whatever truck you decide to buy needs "camper package", this is a factory option that includes the heaviest spring package and a heavy duty alternator and extra cooling for the trans and some other minor tweaks for people who plan on carrying a truck camper or hauling a camper.
Heavy Duty suspension, rear sway bar and more engine are choices you will never regret. Diesel adds a far stouter front end and more weight. Adding my TC to my truck added absolutely no weight to the front end when I weighed everything after it was all loaded up.