Be sure to rest drive it and have your partner drive it as well. We decided to get a smaller MH after a test drive of a 26 footer.
If it drives well (find a hill to go up) the Ford part of it is probably okay.
Our 1992 GM 2500 needed a heater core, alternator, and water pump about 5 years ago with something like that mileage. At the time I wondered if it was worth it and did the work myself or bartered with a mechanic friend. However, there was no further trouble until this winter when it got a nasty noise when working hard and cold. I put new spark plugs, wires and distributor cap into it, which restored its full power but the noise persisted. I feared for the transmission but a new muffler fixed it right up. It is a pleasure to drive now! I'm sure a 1998 working well will last another decade at least.
You can probably fix anything wrong with the house if you are handy. Other than water leak damage. X2 on the pressure check and fix any leaks very well very soon after buying.
2004 E350 Adventurer (Canadian) 20 footer - Alberta, Canada
No TV + 100W solar = no generator needed