Whatever you think is enough - go up another size or two. Neighbor bought himself a steal of a deal on a bumper pull camper. I don't know what it weighs but it's fairly large for what it is. My guess is some 30 feet or more long. He had just retired and bought himself a nice F150 as a retirement present. They took one trip and he immediately went and traded the F150 for a F250. I think he's still a little light in the puller department but he seems to get along ok.