half ton towable 5th wheel toy hauler

I have an F-150 with a 1607 lb. payload. With a 6700 lb. "as loaded" bumper pull 24.5 ft. box toy hauler with two dirt bikes in it (780 lbs. tongue weight) , two people in the truck with gear bags, tool box and some fuel cans, the truck rear axle was loaded to within 50 lbs. of the RGAWR and the truck was loaded to within 180 lbs. of GVWR. A fifth wheel would seriously overload it. The weights add up faster than you expect.