Re the battery charging. The TESLA network is already quite extensive so for the most part they will just charge at the TESLA charge points. Takes 20 to 30 minutes to charge and they are good for another couple hundred miles. Thats probably all they would do in a day anyway if they are on a cross country trek. There are also a ton of public and private charging stations out there now.
There other option is just charge at the campground. Their RV is self sufficient so they can use the camp ground post to charge the car. I imagine they might have to pay a few bucks extra in some places but still kinda cool.
A generator wouldn't work. Way too big a battery for something like a little honda to make difference in a few hours.
