Had this happen to me as well. My Cutlass Convertible turned into a 79 Honda Civic. Check over the U-haul trailer carefully-they have been known to rent some crap. As long as you take your time, and know you are going to get single digit gas mileage, you should be fine.For an emergency recovery, a couple of us drove a 2WD trailvoy with a 2200 pound trailer carrying my 5000 pound Envoy from Colorado to San Diego through a couple of mountains . Hope to never do it again, but it was not a kamikaze mission. The east part of the country has nothing like those mountains.
The trailer rental place had some software that knew the weight of various vehicles and the towing capacity of the trailblazer, so we had to claim we were carrying a Honda Civic on the trailer before they'd rent it out.
I'm going to have to disagree with you on this...As long as you take your time, and know you are going to get single digit gas mileage, you should be fine.