Try looking up the value of a Newell or a Prevost on NADA. Establishing the value is part of the loan process in addition to the 10 YO rule.
Every Coach/Bus has its problems; bulkhead separation, bus air, cruise air, etc. You have to do your research so as to not be blind sided with cost.
Paying cash can be lowest cost, but does not take in to account the individual value of personal choice. If cost = value then the love of your life is money. For example, fresh caught trout is a nothin', I've caught zillions. Most are farm raised and stocked. Now, if you caught it at the head waters used for the gene pool with a lure made of a safety pin and the fresh hatch, you might have something of value.
IMHO