Thanks. I'm not crazy about the idea of having the spare on the roof, but I'm looking for a system that allows towing a small motorcycle trailer, mounting a bicycle rack and getting the spare out of the trunk to make room for heaps of gear, sometimes all at the same time.
I don't have a QR axle on one of the bicycles, so I don't want to get a roof-mounted bike rack.
I need a new rear bumper, so I thought a bumper with a hitch receiver for the bike rack, the existing hitch for the trailer and tossing the spare to the roof would work.
The other consideration is I have a sunroof, so any roof rack needs to clear that. That's why I zero'ed in on that short Rola Rack.