my 2 cents says better to have too much truck than not enough truck. tell you what to do. do you have any hill where you live? tell dealer you want to test the two trucks and hook up your TT and drive them. that's what we do around here. we have a hill called cabbage hill and it is nationally know as a son of a gun hill. ask any OTR truck driver and he will know the hill. any dealer wanting to make a happy customer sale will let you test drive the truck so you will be happy and a return customer. if not go find one.