There are a few gasser fans on here, but I question whether they really tow anything of size. Either that, or they just like the scream of a gasser as its going up hills, etc. I tow a 30+' TT and it wasn't until I went with diesel power that I enjoyed it. I'm in TX so no mountainous terrain really, but we still get some low grade hills that any gasser I ever owned just had to downshift a couple gears and really get that engine screaming to hold 65-70 mph.
As for the half ton, in any kind of decent cross wind its going to get pushed pretty good towing a 30' TT. Will it handle it, yes, but its no fun. The XD will tow more like a 3/4 with cross winds, etc given its size and weight.
Just my two cents.