Thanks guys. I have Timbrens now and E rated tires (though looking at new Toyos which have a higher weight rating) and ordered Tork Lift Stable Loads to install before picking up the camper (if we buy it).
I had a Fleetwood Angler 9D which I am guessing was 1500 lbs lighter loaded (it had a dry weight of 1680 according to the sticker and little to no options -- not even a radio) and it squatted the truck 1" total and wasn't a problem at all to haul even offroad in rough terrain. I also pulled a 3500lbs sawmill behind it and loaded the back seat of the truck with a couple hundred pounds of gear and the camper too (and the mill).

This was my setup then. I'll still need to pull the mill and can add more gear to it vs inside the truck/camper but I want more headroom in the overcab 'bedroom' and am a big guy (250lbs 6' tall) and need a bigger bathroom. I use the camper as a 'home' when I am out on milling jobs and bought the F350 so I could pull the mill into various offroad locations without much issue. Won't be changing the truck too soon but might in a couple years or 3 if it really doesn't work out.