Most of the HWH systems fill once you hit the store button. If you need to sneak out you could raise the jacks with the front and aft buttons, then tiptoe out of the garage and hit the store button once you are clear of the garage.
But, I'd be careful because you have overhead door openers, lights, and "stuff" hanging inside the garage. Depending upon your ceiling height you could be in for a surprise if you press the store button when inside the garage.
I also assume that you have physically measured the coach for it's overall height. Sales literature and factory specs are pretty much useless when measuring height. You need to find the highest point on your coach (ladder, satellite dome, etc) and then measure down from there.