So my parents finally got an appointment for the body shop for this Friday, and it will obviously be there at least over the weekend. It's a shop that's only a couple of blocks away from the Tesla Berkeley service center. I was in the neighborhood and stopped by to ask about loaners with body/paint work covered by Tesla, and the advisor said they should have loaners available for body/paint work that Tesla pays for. I mentioned the last time my parents got a Model S P100D for a day, and the service advisor said they don't typically have ones that nice, but they're occasionally available. Usually Model 3s and Model Ys.
Whatever loaner they get, they want to take on a longer trip than last time they had a Model S P100D loaner, especially having it over (at least) the weekend. It's interesting since I'm helping them plan and probably doing most of the driving. There seem to be Tesla Superchargers along the route, but it won't be like being in the San Francisco Bay Area. This will take some more careful planning and a check to make sure that they're operating.
I'm also thinking it might be possible to set up a "phone key" with a loaner, just in case. Of course delete any other phone keys but then delete my own when done.
I guess the other thing is that the body shop probably needs one of the Tesla card keys. I should remind my mom to bring one.