So my buddy just called me up telling me a story. He drives a 2006 Volkswagen Passat 3.6. He's in Texas right now and says he was driving on the highway at a high rate of speed (probably about 100) when a truck had some rocks fly out the top and he says it hit the ground and i guess bounced up and heard a big bang from under the car. He noticed his fuel gauge dropping. He pulls over and checks and see's gas leaking from the fuel tank under the car. Dealer claims $2100 to fix it not covered under warranty.

My questions:
1) Is this a plausible situation?
2) If it is plausible then isn't that VERY dangerous?