[mattman44]

Anyone seen these? Watch the homepage video for a Tesla charger. It has solar and battery setup for power. Pricey of course but no need for a grid plug or destination charger.
Living Vehicle : Luxury Unplugged

 

[Cali Electric Adventures]

Here's an article about a smaller 'tear drop' type trailer that's meant to be towed by an EV. It has batteries to charge your vehicle up at your location. Very interesting, but still pricey though for its size.
Teardrop camper trailer fast-charges EVs with 75 kwh of extra batteries (greencarreports.com)

The Boulder™ EV — Colorado Teardrop Campers (coloradoteardropsgear.com)