The craziest vehicles are the food ones with burning coal grills on them. I've seen them driving down the street with the coals burning. But those are usually a modified motorbike instead of a kind of truck. There's no shortage of ingenuity in Vietnam.
Here's a custom truck from Europe.
I spotted this one in Budapest, Hungary. It belonged to a park and it was used to carry gardening equipment and things like that.
Nice, ya, I've seen a lot of stories about woodgas trucks from the 1930's to present day.