Have a battery in the trailer augment the battery in the pull vehicle. The big issue will be to tap into the tow vehicle so that the trailer battery can supply power in all operating modes.
Yes, RV park with a 240 V socket would be where I would go. Most of them are already pull through.
Someone's feeling out that part of the market. I think an important trick would be to get the trailer to regen instead of braking.
https://www.coloradoteardropsgear.com/theboulder/
RV parks are good for an overnight charge for sure. EV car camping is already a thing using them.
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