My web source for GM online ordering guide shows server issues so I can't look at GM trucks RAWR specs for a 7200 GVWR 1500 hd truck.It is the high country model which is built quite a bit heavier duty the sticker in the door says combined weight should not exceed 1491#
There is a max tow package with a higher RAWR package for carrying more pin/GN hitch loads. If I can find it I'll post it for you.
Any how your 1500 can tow a 5th wheel trailer. It all depend on the trailers loaded gross weight and the trailers fully loaded pin weight doesn't exceed the trucks RAWR as it carrying all the pin weight.
Check out this website for smaller 5th wheel trailers for any size 1/2 ton truck. http://www.allencampermfg.com/5th-Wheel-Floor-Plans.html