I have a Grandby (8') in my standard bed (6.5') Silverado loaded with the tailgate down. This issue is center of gravity. My camper weighs about 2,000 lbs loaded and the CG is just at the back of the rear wheels, but I have a 1 ton truck with a tongue weight of 15,000 lbs so any weight the Grandby puts behind my rear wheels is well within the limits. I'm also no where near my GVRW so the truck barely feels the camper in the back.
Because you have a 1/2 ton, I think you'll find the steering will feel light probably too light. You'll also need to beef up your suspension but don't know if that will eleviate the light steering feel. Guessing loaded, you'll be pretty close to gross weight. That combined with the very rear CG might be an issue.