Picking the right camper for my 1500 series GMC pickup...

Four Wheel Campers makes the Four Wheel Hawk that is a perfect fit for your truck. The fact it has minimum overhang will also make it easier for you to tow the boat. Once loaded for camping you'll probably still be overweight, but not as overweight as if you tried to go with something larger. You can pretty much forget anything with a full bath.

One of the first things you're going to want to check is your tires. Those are generally the weak link in payload.