Etiquette on contacting past owner of your new RV

Certainly some different strokes for different folks.

It's certainly a pity that a simple phone call about something innocuous as ownership of stuff seems like a threat or breach of one's privacy. I guess it's the times, folks want no one in their lives except who they choose.

I'd make the call, not involve the dealer, and keep it brief. If you had an email address, it would be less intrusion felt, in most cases.