I had a chance to surf for battery pack prices and it was only the chair design which kept me off the floor.
Nissan wants $15,000 for a replacement pack for their LEAF.
That's $625.00/kW-hr.
Since 16-kW-hr is not uncommon with entry-level EVs ,I don't foresee a time when ANYONE would be in a position to do a trailer like this.
Perhaps EV 'filling stations' on the outskirts of town could rent them for excursions.
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My thoughts turn to a 750cc Toyota motorcycle with Atkinson-cycle,turbo,Concept-II powerplant (43.7 % thermal efficiency!) with the front fork removed as Walter Korff did with his 3-wheeler,integrated as a full-bodied one-wheel RXT-P (pusher) trailer with gap-fillers for visits to Grandma's,then restored as a motorcycle for the intervening time.
Being gasoline,it wouldn't compete with truckers for diesel (they're beat up enough already with fuel prices).
