Hmmm What's Going on Here?

While spending a Saturday afternoon out and about, Kwang and I came across truck after truck piled high with gas tanks. With very part of the city we visited there was the random gas tank truck. They didn't move either went the sun went down. It seemed as if they were permanently parked in their spots. Very strange. It seems like a lot of gas for BBQ's that are often powered by charcoal. Hmmmm...