Gear ratios are a very big deal when towing. If you've got $20K to throw around, by all means but the Tundra Crew Max, with the 5.7 V8, 2008 and later on your list. 6 speed trans, 4.30 rear end, 381 HP, 401 ft lbs of torque. It will pull that trailer of yours around like a little toy. Big Crew Max cab is same as the Dodge Mega Cab.
I just sold my 2007 Tundra Crew Max for $16,500 with 100K miles. Best truck I ever owned and plenty of power. Was not in the repair shop a single time. I'd buy another one but the new trailer requires a 2500 series truck.
