Need someone knowledgable about Thor rvs 90s

They are asking $7,500, on the lower end of the diesel pushers that we have been looking at. My wife and I recently sold our 87 Toyota sunrader 21' motorhome to buy a Class A. We are wanting to spend 2-3months next year traveling the country so are looking for fully self contained models. This one has a washer/dryer, full bathroom, oven and microwave, etc. To specifically asked if all the appliances, water systems, heat and a/c, worked and they said yes. Unfortunately in my experience with car sales, people's word is only as good as far as you can throw them!

Initially we were/are looking for a 90s class a with either the 12v or 24v (depending on the year) 5.9l cummins engine paired with the allison transmission.