Uwe, as Gerald points out, leveling on a very off-level site creates an out-of-whack opening in the body that you are then going to try and shove a relatively square small room through. It's kinda akin to the old square peg/round hole analogy. Monaco has gone against the grain a bit since most other manufacturers tout the opposite routine, but I agree with and follow the instruction I've read from Beaver/Monaco and was given by Beaver Coach Sales/Service: "Slides out first and in last", as Dick mentioned.
Chuck, though they share many components including the control module on the ceiling of your electric bay, the air leveling system (if you use it in lieu of hydraulic leveling) and Travel balancing system are two separately controlled functions. You may occasionally notice the coach seem askew after pulling off the highway, parking, and going outside. It's not uncommon for one airbag to be left inflated more or less than the others at the point it was at in adjusting travel position when the engine was shut off; it has nothing to do with air leveling at a campsite, storage pad, or etc. Also, your bedslide is electric rather than hydraulic like the rest. There can be special issues with that operation, especially regarding its brake. If you're bedslide has become finicky, you should probably have its mechanism and alignment checked sometime by a tech knowledgeable about it, such as at one of the facilities in Bend.
Joel