When you say 'pre-delivery' are you really referring to post purchase? To me pre delivery means getting the coach ready for my final 'pre-delivery' inspection and acceptance, then the dealer gets my money. On my last two used coach purchases, I gave the dealer no money and signed nothing (other than an agreement to purchase with conditions) until any issues were addressed and the coach was ready for my final inspection and acceptance.
If you have already paid for the coach, it seems you will have to want unless your contract allows you to exit.
