Tow Vehicle: Go straight to the 1 ton. If you don't want a dually, then 19.5 wheels and tires on a SRW will provide the wheel/tire load capacity. IMO, the SRW is the better option for offroad driving. Just as an example for truck camper/tow vehicles: my first TC was a pop-up and I know of at least 2 other pop-up owners with similar campers. We all had 2500 series trucks and we ALL put on suspension upgrades...with a pop-up.
Truck Camper: Visit as many different brands yourself. Since you live in the Beautiful Pacific Northwest, I recommend you look at the Adventurer/Eagle Cap line. But look at as many different brands yourself and I think you'll quickly find out which one is right for you. I don't think one brand is that much superior to the other. Once you visited and started to narrow down what you think you want for your camper start doing the math. Camper weight + options + water + gear + people = trucks payload. Then you'll know what truck you need!