I recently bought a Toyota Sienna and need to devise a combination rack system for the interior of the vehicle. The Mrs and I have road bikes and locking blockheads for the forks, which I have installed on a 2x4. But, I need some ideas for the kids bikes, which do not have quick release front hubs. So I need to secure them upright between our bikes in the back of the minivan. If you got some ideas, pass em along. I don't want to spend a whole lot, as one of the boys is about to transfer to a road bike and his blockhead will be installed on the same 2x4 as ours.