Don't want to compromise anything? Then, I would change out the stock receiver. If the cabover extends beyond the truck bed Torklift makes a very nice Super Truss for a hitch extension. Consider suspension modifications, air bags, more springs, etc. to handle the weight. However, first look at the payload of your truck, understand the tongue weight of the boat, and the fully loaded (not dry or brochure) weights of the cabover you are interested in. You might be shocked how little camper you can carry and stay under or at GVWR. If you are willing to go for a one ton dually you probably can tow the 7-9000 pound boat and carry a fairly large and well equipped cabover that extends beyond the rear of the truck.