That RAM pic is interesting. I think, like most things, a combination of issues. I'd bet that load is somewhere around 5 yards/15000 lbs if a 16' trailer. I doubt that loader bucket would have that much volume. I don't see where the loader would have pressed down. But maybe even worse, if the bucket were somewhat packed and dumped from a higher than normal level to avoid the wood extensions could definitely have contributed to the dynamic loading. I think the static load is beyond maxed out, but I cannot see the static load "breaking" that frame like that. I think a slowly applied "static" load would have lifted the front off the ground before the frame yielded. This sure seems like an impact to me.