Now if you really want to think of this a different way -
http://www.automatedsafetyhitch.com - a guy pulled in for fuel with a Ford Excursion and a safety hitch - said he had a 42' 5er at the campground - they were headed to the west coast via CO from east Texas. the Safety Hitch lets the wheels turn when the 4 ways of turn signal are on, otherwise wheels are locked straight ... talk about load ratings