Here's something that could also help him out. If there's a large enough inverter available that could be mounted in the truck, he could operate off the truck's battery for a limited time, if there wasn't any shore power available. It might also work to charge the pod battery. Start truck, plug in battery charger, turn on inverter. Then again, if he's not very well "automotive familiar", it could be a monumental mistake to rig that capability.
I think Walmart still allows overnight use of their lots, but don't know if power is available. Local campgrounds might also have spaces available, even in winter.
Roger