I'd thought about doing this for a while, but finally pulled the plug on Friday. With 3 cross bikes going in the back of my little pick-up, and not much extra in the cookie jar, I came up with this:
Total out-of-pocket cost: $1.98 for a roll of galvanised plumbers strapping.
5ft-long 2x6, some drywall screws that I already had, and 3 old front hubs in the junk bin.
Ya, it's Ghetto, but worked like a charm!