Pretty much the only thing that is really manufacturer specific is the front and rear caps. Monaco had the Roadmaster chassis, but it was built with front and rear end suspension parts used by many. There are very few parts that are no longer available, but when they do become obsolete, there is always someone that finds something else that will work.
Monaco's parts department never really closed through all of the changes and is still open today. With that said, even though they're still open, many of the companies that supplied components to them went out of business in 2009-2010. This is not just a Monaco issue, but an issue for every manufacturer.
I would never be afraid of buying an orphan, especially a Monaco coach. They're still one of the most popular and best built brands on the road.
