I would say get some long planks, or 3/4 inch plywood sheets (4x8) and put under the truck. Use this as a weight distribution under the stands and jacks. I would park something heavy on the uphill side (truck, tractor, something) parallel to this truck, and chain this truck to it, that way it would have to pull it sideways to move it. Put as many stands as you have under there, or better, crib it up in multiple spots. Use longer boards to crib it to spread out the weight. This is what we would do in a rescue situation when a vehicle is in a ditch, or on it's side so we can safely extricate someone.
The important thing to remember is what Dad told me at a young age. Never put anything under a vehicle that's jacked up that up that you aren't willing to loose.....
This technique is what I am talking about:
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