My trip in my Hotel Prius:

Slept in the Prius except for 6 nights which I spent in a motel in Yuma and then one night in Surprise, AZ while getting the Prius repaired.

I made use of Walmart parking lots quite often and found them to be safe and fairly quite.  I did use Home Depot once which was next door to a Walmart in Sidell, LA  that I didn't like that well, I stayed at a National Park campground for 4 nights near Prescott, AZ and it was nice, $7 a night.

I used McDonalds often for WiFi so I could update my wife on my where-abouts.  Once or twice I was able to use Walmart WiFi but they don't all have it.