Insurance, I guess?
I watched a fellow drag a travel trailer under the K Street Bridge in Needles, California. I tried to stop him by yelling out my window and flashing my lights...and thought he heard me for a moment...then he pulled his trailer through anyway.
Everything above the roof line ended up on the ground behind the trailer.
The video below is the same bridge. But not the same situation I saw. The fellow I saw didn't get stuck...he just pulled right through and stopped on the other side. I helped him pick up the pieces and put them in his truck.
https://zachnews.net/2017/12/22/live...eet-underpass/
Here's another one. I guess that bridge has claimed quite a few RVs.
https://zachnews.net/2018/09/17/need...eet-underpass/