There is a very good chance that my response will be the oldest coach, maybe not by miles though. The coach is a 1973 GMC it shows 78K and I have records from PO that show that this is the second time around. We have done 70+ of that. The coach was down a lot of last year because a piston broke. I could have bought a replacement engine, but I don't let people I don't know touch my engines and everybody I used to trust retired if they made it.....
Point being, I do the maintenance.
Grease is cheaper than parts.
You want the coach to run forever?
You want the coach to be reliable?
Get the manuals, learn to do what it needs. You cannot pay someone to be as conscientious as is required. If something is a little off, put it on the list to get at least looked at if not repaired.
Chaumière will be going a thousand miles in a few weeks and the backhaul will be half again more.
An older coach requires love. Just like your senior dog. If you aren't ready, buy something newer and get ready to trade off to new problems regularly.
Matt