I highly recommend that you do not let the service writer at the dealership just have you leave the motorhome. They will carefully schedule for full-timers, or customers that insist. If he still insists on it, then Thor Corporate can reimburse you for the months of financing payments, (assuming it's financed), while it sits at the dealer's lot waiting.
I schedule my warranty service so that it is all work is performed within 48 hours or dropping it off, and I pick it up completed, after an inspection by me and the service writer. I have done that for the past 4 RVs I have owned.
I learned the hard way, (when I owned a PopUp), many years ago to never leave my RV for service.