Looking for a TT & TV combo. The TV will be either a GM 1500 Reg cab, w/V6 or 4.8 V8 & auto trans (rated at about 5000#), or a Tacoma 5-speed manual trans (rated 3500#). Both these can be had for less than $15K, out the door & be good for everyday use. Is the a 18' or bigger TT, that will work for me? It's flat were I plan to travel, so no mountains to climb.