IMO no less than a 3/4 ton diesel. Only reason I say 3/4 ton diesel is because they generally have lower payloads than 3/4 ton gassers but more than most 1/2 ton gassers. If it were me I'd get a 14 Ram 2500 6.4 with 3.73 gears. 3000lbs +/- for payload. That TT will be in the neighborhood of 8500lbs when loaded. I tow 9000lbs with my 12 Ram 2500 CTD. It's well worth the extra $$$ for the diesel option for me as I tow on mostly hilly and mountain roads. If I towed on flat land most of the time or only went out 4-5 times a year then I'd have a gasser. That's a big TT by TT standards and it'll move a 1/2 ton around pretty easy. At almost 36' long that's 8' longer than my 5'er. No way would I want 36' and 8500lbs behind a 1/2 ton truck. Especially if I was new to towing big trailers.