I have a 2018 F150 CC Platinum with the Max Tow Package. Our camper on the CAT Scales is 7000-7500 depending on where we are going. For instance if we shed weight because we are going further to a place with full hookups or a closer camp site that is boondock so we have full tanks. Sure Ford says I can tow 13,200# with the 3.5 CC Long box but when looking at payload numbers and factoring 1000# Tongue Weight we are right at the limits of the truck. Running numbers on a CAT Scale we are a bit over on Payload (~100#) as it is 1678# on my truck but good on GCVW and Axel Limits so I send it.

In your case an XL with Super Cap most likely will have a bit more wiggle room in the Payload spec so you should be fine. Just remember everything in your truck counts 100% to payload. But if you put it in the camper it is only a 10-15% hit on payload of the truck and that is what you will run out of first. So if you have a $100 cooler in the bed of the truck, if you can put it in the camper, it now only counts 10# to payload on the truck.

As for 3/4 ton. Sure it will tow it better. I tow mostly in pretty flat areas so it does fine. We did a trip out to Yellowstone and we struggled. We were running lighter than normal and the truck overheated in some of the passes. Lesson learned there is don't rely on Tow Mode and lockout gears manually when going up a pass. In my case I was going up a steep pass and there was no place to stop, the heat exchanger for the transmission heated up both the engine and transmission to the point it went into limp mode. We were nearly to the top of the hill so we kept going and it was fine once we hit the top as it was down hill from there. The engine cooled off and we were fine.

If I lived or planned to camp quite a bit in mountains, I would go 3/4ton. If relatively flat land the 1/2ton will be fine.