Proper truck set up for TC?

Even without a certification your owners manual may contain info about your center of gravity. Your truck sounds like it would handle a smallish camper just fine, especially with how you have laid out your weights and capacities. As stated, your center of gravity is the biggest issue after the other stuff. If you got a 8.5' max built for a short bed, the online specs will give the camper COG. Look for a layout with heavier stuff forward (fridge, etc.) If no joy on a privy, try a large model portable toilet and put it in a closet. We built a 3/4 inch plywood base with 2x2 framed top and bottom and plastic chair sliders and a handle on the front, painted a nice gloss easy to clean. Moves nice on the sliders from cabinet to use location and raised it to residential height. Truck camp ALASKA absolutely!