a dude around here used to have some on a huge f350 and we werent even near a train track and he blasted them i damn near ran off the road lol
they rattle the inside my truck because they are mounted where my spare tire is suppose to be. i **** you not, if your standing next to my truck when they go off, you feel the ground vibrate.
I know I was pissing behind my truck one time and a friend of mine hit em while I was back there, I could feel my paints moving from the air/ vibrations. J.Wal