Many camp situations, you simply cant get "perfectly" level. At times when manually leveling, I just figure good enough; 1-2 inches is no concern in my experience, been off level more at times.
9" is indeed excessive. Some sort of ramp implementation seems appropriate, but note the ramp sliding problem. If you can get it to 1-2-3 inch level, I would think good enough. Although cabinet door swing, floor unlevel... will be an irritant.
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