Ditto on the mega cab if you're worried about the weight, but you'll have to pack awful heavy to get to 4500 lbs. It will be close to 2 tons though depending on how you pack but I think the weights I've seen in here don't break 4k.
Any srw HD short bed pickup will handle the camper fine, but you won't be within the mfgs typically conservative ratings and you may want need to do some minor suspension mods.
Do not worry about hauling that on a new F350 of any configuration.
Personal preference, but give the built in generator some hard thought. They're convienent on one hand, but loud (inside), expensive, relatively inaccessible and use a lot of propane.
I mounted a Honda 2000 in the same "wing" area on our AF 860. Of course you have to remove it to use it, but you're not sitting on top of a running generator. JMO on the built in generator thing.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold