Sorry to hear of your bad luck. I'm glad to hear that you could laugh after it happened!
Last year, we got off the 5 freeway somewhere in Oregon and made a wrong turn and had to go under a very low bridge. No traffic, so I got out and went to the back of the trailer, climbed the ladder and looked!
All I had to do was move over a little to get centered and we cleared by 2"!
Then when we got turned around and went back under the same bridge, it was a piece of cake! But we heard the radio antennae hit.
Good Luck & Drive Safe!