I think Ken's decision to carry spare belts is one everybody should follow. I have seen a wide variety of accessory configurations on our coaches, and since some of them are converter installations it is probable they are not tested as rigorously as pure Prevost systems that are designed for commercial service reliability.

I see no downside to carrying spare fuel filters, spare belts, and a gallon or two of all fluids. Other spares should include common relays, light bulbs, fuses or circuit breakers, and fittings to replace air hoses or cap existing ones in the event of brake chamber diaphragm failure.