The Sofrider has closer to
The Sofrider has closer to the standard MB seatpost, but from the angles, you at most have to remove the folding rack, and find the proper mounting height for clearence. I've owned the Travoy, and had it on various uprights (Still waiting on my Q3.) but it's pretty forgiving with enough adjustment to clear the wheel. There is some pogoing inherent to the system, though, and the balance will probably be tricky to re-learn.