Etiquette on contacting past owner of your new RV

We have had people call us before when we had traded in trucks. We wouldn't mind.

The only issue I can think off that could present a problem would be if the dealer had lied to you about things. If the previous owner told you the truth and there were issues with the unit, I would think you would expect to have all contact with the dealer over with. He certainly is not going to admit he lied and any service work he did would have to be questioned.