I am barely 1 month into our Prevost ownership and have an awful lot to learn about the coach. Our previous RV has air ride but it cannot be controlled. Here is my question. I will be taking the coach down a 300-400 feet long dirt road driveway to stay at my brother in law's place and want to avoid bottoming out. So my thinking is, I can raise the level to maximum? What is maximum? Will it stop automatically when it reaches maximum height? And the other way around, how do I dump air? I do apologize for my ignorance and will appreciate all advice. Thanks, Ronald