As a class A full-timer, I've spent plenty of nights at the dealer's shop. Some repair shops have full hookups outside the shop and will move you back out every evening. Some work on your coach while it is still hooked up. One shop in Tucson had the full hookup right outside the service shop and it was covered by a porch. The whole property was locked behind a chain linked fence. I would have to call security to get in our out in the evenings.
The point is, you wouldn't be the first full-time customer to come in without an alternative place to stay. This happens all the time and virtually every shop will suggest the most appropriate way to handle your situation.
Don't let that influence your thinking. You'll always find a way to solve every problem. If not, you can post to this forum and someone will figure it out.