There's more than 1 good reason for backrolling.
Those are cool, but you still have to get in the corners and imagine are quite heavy..?This is now drifting off the OP's direct question and all. But Graco reps were at my local SW store once demo'ing their "Jetroller" system. I was pretty intrigued, but the co. wasn't ready to drop the dough.
I'm surprised I've not seen mention of them here (which doesn't mean there aren't any!), and wondering if anyone has one, had tried one, etc. I'm posting a link to an 18" (below), but they also have 9's. Maybe 14's - haven't really looked.