A lot of times if not all. A 3/4 ton over a 1/2 ton will have beefier springs and other parts to allow you to tow more w/o upsetting the truck. Even a top of the line Titan needs some bags in the rear to beef up the suspension so the rear end doesnt sag.

If you dont go diesel I would go for at least a 3/4 ton truck. With trailer brakes. That would be plenty. Diesel used to be cheaper and gas engines are getting better mpg. Its cheaper to have a gas truck fuel wise.

 

Dodge Cummins with Allison tranny swap run on vege oil