Was Hank Hill Hazardous Materials certified or not because in Snow Job he wasnt but in Rodeo Days he drove a truck with Bobby into the country and delivered a man named Roy some propane And Why is Hank as Assistant manager delivering propane anyway thats what Joe Jack and Enrique do,

Good question I'm not sure never really thought about that.

There are a lot of continuity irregularities on the show - if you take the time out of what should be a beautiful life to pick them out. In one of the episodes, he claims he's been driving a bobtail for twenty years.... go figure.