Don't wait for a problem to consult a lawyer. Better to spend a couple hundred to get one on board and not need him than to be scrambling all summer with no RV, listening to dealership excuses and playing pass the buck.
Find one that does this sort of thing, give him some $$ as a retainer and have him send a letter to the dealership that sold you the RV letting them know that he represents you and they can send legal details to him.
The most organized group usually wins the conflict, right now the dealership is well organized and you are not. You can hope for the best or plan for the worst.
With a good lawyer you may be able to get the RV repaired right away without releasing the dealership from liability and have full use of your RV while the dispute plays out. Put the repairs on a card and when you win they have to pay the interest as well.