The strut ... which was held on only by sheet metal screws (this was my first time working with sheet metal, I even asked here for advice, and the re-mounting will be much better!) .... looks to have been pulled straight away from the wall. The only damage is to the screw holes. I will -maybe- learn more when I re-attach it.
That white panel is only a piece of styrofoam insulation.
As for the spray foam, the tenant had constructed a 'second floor' within the unit. It appears that he had a lead foundry below, and housing for illegal immigrants above. Likewise, the trailer was additional "housing."
