I've seen several discussions regarding slides coming out on their own and the suggestion that there may be an internal seal leak. This may very well be my problem. I'm asking about the effect of altitude on the hydraulics because the slide room has done this only a few times. I just finished a 4,000 mile month long trip and this only happened one time after crossing the Rockies at over 11,000 feet via Monarch Pass. It's probably only happened 4 or 5 times in the past year. The slides move out while driving about 1-2". I close them back up using the handheld remote and it doesn't happen again for the next 1,000 miles home.