"3 and 4 wheeled blue trucks of death."

Friends and I refer to them as "Blacka' Blacka'" trucks. They seem to run on used cooking oil because they are always collecting it in filthy barrels, or are they delivering it for use?

Then there are those little 150cc 3 wheeled cars, I think if the vans are "mianbao che" than maybe they could be "baozi che"?