+1 on Caymen's statement on frontal area. The ST manual states 40 ft^2 more than the base trac area, which isn't a lot. The trailer in my pic is 7-1/2 ft wide, and 9 ft tall. It sits low to the ground, and it is with in the 40 ft^2 spec.. The length is kind of inversed, IMHO, the longer the tongue, the better it will tow. Mine is really stable, and has not swayed once, although i have friction sway control... I would strongly recommend LT tires if you are towing anything that big. The LT tire's sidewalls are much stiffer...