I have driven this coach for over 30K miles. The coach is said to be 13'2" There are two antennas on springs on each corner of the front that go above that. I have hit the antennas on tree branches and top of my garage door but that has been about the only times and I was waiting on the noise.
I have never worried about going under bridges when on any interstate. The other day was headed north on I95 around New York City. I am in the middle lane and the traffic is running around 5-20 mph As I come up to this bridge there is a sign that says the heights of the right and left lane are 12' something. The center lane was 13'6" I feel relived that I am in a lane I am not going to rip the top of the coach off. As I go under the bridge the antennas are bouncing off the bottom of the bridge. There were a lot more bridges we go under with no sign of height and the antennas are hitting the bottom of the bridges. Every time we got to a bridge we would stress and would scare us when we would hear the antennas bouncing off the bottom of the bridge.
When we stopped for the night I went up on the roof and one of the brackets for one of the antennas was loose and I put silicone around the bolts. I also tie rap the antenna's down so they would be lower the the side rails.
I think that was the most stressful trip I had ever been on.
We were recently up in New York and that was one of my main concerns.
If you get on the Allstays app you'll see a lot of tunnels and bridges marked around New York City and the surrounding area.
Some byways and expressways don't even allow trucks and RVs and those are not marked with height restrictions.
Although I have a ran McNally GPS which has been mostly accurate I ended up purchasing the app CoPilot GPS as a secondary source while navigating in the NY area.
That does sound extremely stressful. I also worry about the overlay of these highways and how up to date the bridge height signs are. There's a bridge just across the Texas border that I will not go under just because I don't trust the height sign.
It is one reason I avoided the city in the past. Also when FT was building the IH I said to them the east coast has low bridges and 3 foot is too tall and one reason I never bought one.
That is maximum buttock flex.
I drove down from Stamford conn to Culpeper va in a pickup pulling a 25 foot trailer, came through enough of New York for me never to do that again. In a MH not chance ever.
Bought the Co-pilot app, set up the perimeters and the first trip out it brought us down a road with a train bridge that a Ford econoline would have a issue getting under! Unhitch the towd, and back up a looooong way until we could make a five point turn. I was very disappointed for such an expensive app!