I stuffed seven disassembled H14's into my brothers 8½'x24' enclosed trailer and dragged it from Iowa to New York state. 12mpg average over the trip. With a triple stack on my trailer I get about the same, maybe 1mpg better. Way less than half the weight, basically the same mileage. The drag of a catamaran on an open trailer is insane.

My work trailer is a 7x18 enclosed Featherlite. I want to say it's 2700 #'s empty. All aluminum. It's got a taller 7' sidewall, it's a shitshow for mileage because of that.