Whose coatings?

It's kind of hard to tell, because this photo was taken with my crummy camera phone (yes, at a stoplight), but it appears that the coatings belong to Barrett's son. It also appears that Mr. or Ms. Barrett does is involved in some sort of dealings with the son's coatings. That conjures up all sorts of wonderful mental images, doesn't it?

(Edit: I guess it's hard to tell that the truck says Barrett and Son's, not Barrett and Sons. Barrett and the one son may very well own the coatings, but I doubt it.)