The only style that I have seen requires you to remove the front tire and the fork fits into a clamp style locking system. They actually modify a cleat to fit the clamp too.
Thanks guys. I've also been wondering about this...Check out rocky mounts. They make a bike mount for the utilitrack. I've got one and love it.
I used my old mounts and bolted them with Superstruts (for electrical conduit mounting) from Home Depot. 1/4" bolt fits in the threaded hole and a spring loaded superstrut slides right into the utili-trac rail. They can be used for bolting just about anything to the rail.
Just go to your local homedepot or lowes and check out the spring nuts. They are located in the electrical section next to the C-channels. If you can't find them, just ask the electrical guy, he should know if he is good at his job.How do you keep the fork on? Can you explain how you did this in detail? Does it securely hold the bike even on rutted gravel roads? I want to do something like this but am totally unfamiliar with electrical things. I'd appreciate it!