Huge task

Came across this, late this afternoon. It looks like a sizable task to right this rig. I have no idea what was spilled.

Reminds me of the photos of the semi that was blown over this week by the wind storm. We have at least one semi blown over in the Columbia Gorge when ever we get the east wind blowing.

Looks like that rig across from it has some graplers and hydraulics for the job...Do you know what caused it?