UPDATE:
An investigation was started and the propane representative was brought in for questioning. This is how it went down, with me embellishing some. I believe he went by the name Hank Hill. Hank was led into the interrogation room and put under a hot spot light. The tape recorder was turned on. Question 1, "how do you test propane tanks" Hank says, "every 10 years they are hydrostatically tested using water". Question 2, "do you have your's done"? Hank says, "why yes, we just got a batch back from being tested". At this point said tank was wheeled into the room and inspected. A fresh stamped date of 8/12 was observed. The DA gave a nod and then Hank was led away in handcuffs. The book has been closed on this investigation.

P. S. The forklift has made a full recovery from this traumatic assault on it's fuel system and spark plugs.