My warning to people buying an RV, particularly on a Workhorse chassis, is that while you can still get most anything for the 8.1 (or other mechanical systems on one), finding parts on the shelf is not as easy anymore as Ford engine parts. Back in the 90's I was taking a cross country trip in an old 80's vintage Slant Six Dodge van and with only 90K on it, it jumped the timing chain. Those are not "interference" engines so there was no damage other than to my wallet as I had to sit in a motel for two days while the chain was shipped in. You can't fault the part stores for not keeping stuff in stock when the vehicle is so old that they won't sell many parts for them.