Pickup truck design is extremely inefficient. A "three quarter ton" pickup can easily weigh 7000 to 8000 pounds empty and might only be rated to carry an addition 2000 to 3000 pounds. Simple campers without slides can easily weight over 4000 pounds loaded with water and supplies. Most campers are going to require at least a 1 ton pickup. Even then modifications such as HD shocks, sway bars and airbags might be needed. I think everyone who owns a camper will recommend buying more truck than you think you need.