We had the opportunity to have some work done at a service bay with a 12 ft tall door opening. the top of the coach itself fit below the top of the door opening, but the AC and Satellite dish would not, by about 6". Most of our Beavers are the same height. Some of the higher end coaches, like Newell, Prevost, etc, have more things on top, higher headroom inside, taller tires, etc, all of which push the height up. Legal height restrictions top out for RVs at 13.5', so even those tallest coaches have to be below that limit.
Similarly, the legal width allowable on the highways is 102". This does not include the awnings or mirrors, which are allowed to stick out another 12" on each side. Most don't protrude that far. My Contessa, mirrors and all, is usually 121" wide. Again, I needed to know this, for ferry travel getting to Saltspring Island, where one of the ferries has a 112" wide overheight passage. I needed to swing the mirrors to the front to fit, then swing them back once through the ferry. Passing through the narrow passage without the mirrors for side reference was a treat.