I work for a place that build precast concrete buildings. We make the whole building up as components in our factory, ship them to the site, and put them together with a crane. Kind of like kid's blocks for grownups
Anyway, we often have these massive concrete wall panels going down the road and they have 2' long pieces of rebar sticking out of them. Well, this was before my time there, but apparently some years ago a guy pulling a travel trailer went to pass one of our trucks out on the road and he got in too close and a #11 rebar (about 1 3/8" diameter) ripped into the side of his trailer and opened it right up. They said it wasn't an Airstream, but a white box trailer.
Just the same, I was thinking "Man I'd sure be ticked if I did that!" Talk about a can opener!
Stay away from wide loads and construction equipment!