I believe it is. Here is a you tube video about the stuff.
I just had all the exterior wall in my house sprayed by a company. I am not sure they do trailers.
First picture is a closed cell spray foam that was sprayed 1 inch thick to air seal the wall.What’s the difference between the first and second type of spray? I was thinking of doing that to my basement or at least the main level floor to kill the noise and vibration