Square footage. A little confusing sometimes as they all used to go by the length for the designation. I think they're getting away from it as the length used to be what most folks used to determine if a 3/4 ton or 1 ton vehicle was required to tow it. Before all the new construction techniques and materials used became popular, I used to hear that a 33-34 ft fiver was the limit for 3/4 tons.
2009 Wildcat 29RLBS (2008-2013 traded in on Columbus)
2011 Rockwood Roo 21RS (Bought brand new in Spring 2015-?)
2013 COLUMBUS 325RL (2013-? Currently parked in Florida)
2011 Ford Super Duty Diesel King Ranch