I just bought a 1998 Allegro Class A with only 7,700 miles on it. Having everything still look new is great, but there are some downsides.
So far, I've had to put on new tires, including the spare which has never been on the ground, because they are 10 years old according to the manufacture date code, even though they have great tread left. I replaced both of the front air bags because they were cracked and dry rotted and would no longer hold air. I had to replace the belts and hoses on the engine, again cracked and dry rotted from age and lack of use. I had to replace all three of the batteries, even though they were not very old, because they had sat up and gone dead from lack of use. I had to replace the alternator, which went out, probably from lack of use since alternators generally last more than 7,700 miles. I found dirt dobber nests in the engine air filter compartment as well as other places due to it sitting up for so long. Just before I bought the MH, the previous owner had to have a valve job done on the genset because it hadn't been run enough. Those are the downsides.
The upside is that most everything on the coach still looks new and is still tight. There is not much wear and tear on the equipment so it should last a long time, if properly maintained. I think you have to expect to do some maintenance on an older, low mileage coach right after you buy it because things deteriate with age as well as use. Hope this helps. Good luck searching for your coach.