I just bought my bus. A 30 passenger 2000 Ford E350 diesel in great condition. Will not be using it year round and LOVE the look of the metal upper walls and ceiling. Was planning to insulate the floor and lay down vinyl flooring. Is it totally necessary to pull wall and ceiling panels to re-insulate? I won't be doing that much boondocking and will likely have access to electric for my ac and will probably use a small propane heater for heat in the fall. Considering adding insulation between 2 inch studs under the windows the length of the bus that will also provide a narrow ledge at the windows. Can one get by with not removing the old insulation and adding more to the roof and upper walls?
I hope this makes sense. Sometimes I don't explain things really well.