For four years I towed a 22ft. 5th wheel with a GMC S10 pickup truck with no problems at all. It only had a 4.3L six in it. Never over heated and only on the worst hills did I have to slow down to around 50mph to top them. I'm not saying that was a good package, I'm saying that with the trailer you have and even the small V8 in your vehicle, you should have no problems at all. None. Set the trailer brake up so that it's not on until you hit your brake. Then the trailer brakes should be stopping just a tiny little bit stronger than your tow vehicle brakes are. The proper tow hitch will make a lot of difference. Don't use the over-drive gear either.