...and you can use the manual three lever airbag system to lean your coach away from a tree or other obstacle if it jumps out and smacks your coach, then you can carefully drive away from the tree with no further damage ...and you can lower your airbags all the way down and crawl under a low bridge, like those scary ones in Acadia national park (not suggested) and on the southern end of the Blue Ridge Parkway ...okay, shutting up now :)
I thought those bridges were 10 foot at the Southern end of the Blue Ridge Parkway.
I didn't drive through the tunnels at the south end of the Blue Ridge Parkway with my coach, but I accidentally drove under Stanley Brook bridge in Acadia national park, which was posted as being 10'4" southbound and 10'7" northbound... I was going southbound :o ...It's an arch bridge and they're measuring the height at the right edge of the lane ...but still, don't do it!
Years ago my ex and I wanted to see Mount Rushmore. I was driving a Freightliner with short stacks, and pulling a flat bed. We dropped the trailer a couple miles away and "bobtailed" to the monument. Close to the monument there was a short tunnel. The ex sat on the ledge of the passenger window looking over the top of the tractor and would give me direction, i.e. " a little left now". We made it through and to the monument.
Having pulled a lot of oversized loads over a lot of miles, I can testify that you can put large vehicles through smaller spaces than you would think, but you do have to think.
And observe.
And react.
And take your time.
Happy trails!