RE: Securing Planes in Trailers
We used bungee straps and blocks wrapped in velcro. The floors were carpeted and the velcro would stick to the carpet. Did not really need the blocks, but the held so good that they prevented some things from moving around.
The wings were in wings bags and strapped to the sides of the trailer walls. Whichever plane was going to be flown, never required bothering any parts of another plane. In 6 years of using this setup, not a single dent in anything.