This is a little off topic, but not much since when someone says "Monster Truck" this is what comes to mind for me...
I was surfing around on a big rig site, and came across these photos that blew my mind.
This happened in Australia in 1999, the truck was coming around a corner, and that really big rock in the back shifted. It was so heavy, that it bent the frame on the truck, and it was stuck in that position, and they never did get it fixed and ended up cutting the truck up for scrap.
Pretty amazing, I always thought those things were indestructable.
http://teamslo.net/repfan/junk/BigRock1.jpg
http://teamslo.net/repfan/junk/BigRock2.jpg
http://teamslo.net/repfan/junk/BigRock3.jpg
http://teamslo.net/repfan/junk/BigRock4.jpg