My wife and I are contemplating renting a TT. I've looked at this very helpful site for my answers but didn't find them, possibly because I tend not to see the obvious! We boated with a large crui...
With that low of miles, and I'll assume it's well maintained and in good shape, my answer changes a bit. I still wouldn't go overboard on size and would try to stay at or under 4000lbs and as low profile as you can live with comfortably. But that truck has some good life in it. Make sure it has a good aftermarket transmission cooler and good trailer brakes and happy camping!