Don't know what your presonal preference is for gas vs diesel as gas powered will certainly handle a 7,200# TT. That TT is generically within the capability of any of the HD Tow Equiped 1/2 tons by the big 3 out there. Pick your favorite
However, since you will be "racking up the miles" in the interest of a lot of miles with as least stress as possible (plenty of capacity & power) I would suggest getting any of the later model 3/4 diesels. Personnally I would avoid the Ford 6.0 diesel but other than that any of the big 3, pick your favorite.