extending slides when the unit is not level front to rear

we use a couple legos as needed to level side to side and as far as front to back, we try to find a spot where the nose may be level or low, then use the landing gear to raise a bit. A small bit of un-level isn't a big issue with ours for operation of slide, we like to keep fridge as level as possible especially in the warmer climate. I think the worst thing on the slide operation is and twist if any you may have in the coach. Good Luck & Be Safe ! ! !