I bought an 8 foot trailer to transport bikes - in my case tandem bikes. I put in fork clamps for five bikes, and like your diagram, placed them head to toe - mostly due to the with of the handle bars.

My question is this: with five front tires removed, what is the best way to story these tires during transport? for now I put them in the trunk of my car, but I would prefer to have a formal storage method insider the trailer.

Thoughts?