This is just a variation of different ways you can use packaging and bags in particular to advertise you product or a message. I found them quite amusing and just simplistic. I find it a great way to advertise through promotional ways.
These trucks are a great example of how to push traditional advertising and make it something fresh and eye-catching. I think this might be concept work rather than actual ads, but the idea could be a great way to utilize semis, buses, and more.