We tried to figure this out and never did anything in the end. But, it seemed folding bikes were the best solution, but they are expensive and good ones are hard to find to actually see them. If you get a folding bike, get the carrying case, put it on the bed or behind the tow vehicle front seats, and drive away. Actually I think Al' is correct—put something that's not slippery on the bed, put the bike on it, and get going, although what you do with it when you want to use the bed is another thing.
A W, don't read this sentence since I haven't mounted a bike at the back. Some trailers have bad rear separation issues and researching that would be wise. There are threads about rear separation.
Gene
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