If it was a construction truck, thats your answer right there. Overloaded the damn truck and cracked the frame.

 

It's definitely possible. The truck just doesn't really seem like it was abused like your typical work truck. I personally think it was used by a foreman or contractor. Somebody who was using a company truck, but wasn't loading it with crap all the time.
Plus I'd just like the bragging rights that go along with saying I'm so awesome I broke my frame lol.

 

That's something to brag about!
Kinda like me killing a tree with a '62 Nova/