To rephrase what I think you are saying, I'm more likely to notice these trucks because they will be specifically branded by the vendors? That makes sense.

I assumed it was that and that they are there basically every day. Always notable on the days when a snow storm is announced and bread will be completely wiped out. Only to be fully stocked the next day.

Pretty much. They do stick out a bit since they don't match the stores' branding.