I have my doubts about that. Number one, Lippert warrants the frame. Number two, did the owner check with Heartland or Lippert to verify what the dealer told him. Number three, who will take care of him if he has a problem. I can almost guaranty that no one will unless it's him that pays.
More than likely he will not have a problem, but if he does. ??? And I think that the only part of warranty to be effected would be the frame....I think.
I had a question about adding my bike rack to the pin box and was told don't do it, it will void the warranty. When I said I am out of warranty I was told to go ahead and do what I wanted, as I should not have a problem.
If you want to add a receiver to pull your Jeep, call Lippert and Heartland and see what they have to say. Then you will know the real story.
Peace
Dave