Etiquette on contacting past owner of your new RV

Would you want to be called out of the clear blue sky by someone that just bought an old car that you thought you'd seen the last of at a dealer's? I know I wouldn't.

Truth be told, I'm surprised there was anything in the rig identifying the previous owner...seems to me that the most appropriate course would be to have the dealer contact them and get their permission for you to call them.