I like the color of paint and the design. She appears to be sitting level, But way above ride height. When you say the leveling system has to run all the time to keep it level. What are You talking about running ? She obviously has Aux air issues with the dump valves unhooked and the pocket doors not working. Does the floor slide over the entry steps work ? The air seat and air horns work ? Are you maybe hearing the Aux compressor running constantly ? 200K on a series 60 is not a lot of miles if it checks out mechanically. Have an oil analysis done on engine and trans. ( saved Me a boatload of $$ one time I had a 52’ Yacht under contract ) Have Prevost check everything out throughly. Especially the pneumatic system. A coach like that in primo shape would be in the ballpark of 140-175K range maybe based on what I have seen online. She needs a lot of love , But She has RIVETS !