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Still, a daunting challenge, which is why I think we see so few gaps filled.
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Can of worms.
Some things you might try:
- Air mattress type thing on each side with a connecting air tube so when one side compresses it inflates on the other side.
- A tongue like thing that extends and retracts on the top front of the trailer. The tip would have a roller ball that bears on the tow vehicle roof and can roll sideways in turns and front to back as the trailer rises and falls on the hitch.
To understand how a box cavity works, look at the advantage offered by a half-tonneau on a pickup truck. It is a cavity that points up right behind the rear wall of the cab.