Hello there. I usually hang out in the Truck Camper section of the forums because that is what we own. However, we've been thinking about upgrading. I've looked at a few manufacturers and seen 11'3...
Having a former rental, I think that the MFG height that comes from them is including the A/C.
The reason is that on the dash there was a sticker that said Clearance 11 Feet, When I got home I measured the RV at it's highest point, the A/C, it measured 10 Ft 6 in. So they gave some leeway.
But like Bobbo I don't drive under anything under 12 Ft.
Who knows who measured that bridge or awning or if the road has been repaved since the last measurement, Don't ask how I know that :B