[Fulltiming]

Sorry Bob, you stated that you had a manual leveling system and I just read right over that without it sticking. I would think you would want to use a similar approach with the manual levelers. Start by lowering the high sides and only raise where you have already lowered the opposite side all the way. Generally, the lowest level that you can level is best. The 120VAC compressor should keep the pressure up but with the manual leveling system, if it leaks down, you will still have to manually relevel it by raising the sides that have dropped.