We are near the limit with our 6cyl 1/2ton '96 Ford PU and a 17' '65 Caravel. I think I could safely pull a 19' Globetrrotter OK. The one thing that I would watch out for is that our Caravel fully loaded is 3600#. There is the potential to stuff more in the extra 2 feet of the GT and get to 3800#+ easy. RJ