It’s scary to think this would have disqualified his ballot. Mail in ballots add a few more layers of potential problems.
I tent camped once on the Northshore in September and it was already getting down in the low forties at night. That would be as cold of weather as I’d want to camp in. It was difficult to stay warm even at that temp in a tent. I’m sure you could handle a lot colder in a camper though.