I've comparison shopped the bike carriers available at some of the stores around here. The problem I've seen is the low max weight capacity of many of them. A rack that is supposed to carry three bikes that can only hold 130 lbs. Granted, I don't have a hitch to put that style on, but even many of them were not rated for 150+ lbs. My beast
weighs in at 84 lbs according to the trade scale at work. I haven't looked closely at roof carriers, but I really don't like the idea of getting the beast up there and down again.