The car dyno is 35+ feet long and a bumper pull. (Class V Hitch) Dyno weighs in at over 13,000 pounds. Pulls like a dream. However I am using a Diesel to pull this much weight. I agree with Hoblick that he should just hook on to trailer and go pull it with his truck. (Trailer loaded of course). My guess is if you get a lot of use out the trailer you will eventually go Diesel. LOW RPM Horsepower (torque) makes all the difference in pulling a heavy trailer. A gas motor truck making 300 wheel at 5000 rpm's is not going to pull near as well as a truck making 200 wheel at 1800 rpm's. Now it would be interesting to do a small turbo on a gas V8. Keep the boost around 8 pounds to be pump gas friendly and you should be able to tow a decent amount of weight with 500 to 600 ft lbs of torque. I forgot to mention the best part of my truck. The exhaust brake does wonders in keeping the truck from running away from the brakes while coming down the mountains. Use the truck you have for now Hoblick. Upgrade to diesel down the road if need be.