Action movie special effects might leave your customer with the impression that a propane tank can explode just from an impact like a falling tree branch or being hit by a vehicle. But the truth is that propane tanks are very robustly constructed, made of heavy steel, designed to withstand collisions of all kinds, and meet all federal safety standards. Causing a propane tank to explode would be extremely difficult under any circumstances. If an action star needs to cause an explosion in real life, they’d be better off trying something else.