Their ETC didn't do squat in the rocks.. from what they said, it is great when it is slick, but jack when you lift a tire or two.. They were spinning and smoking a bunch for sure..
I think it took 6 or 7 hours, with lunch, and a break.. lots of stacking... lota & lots..
For low ground clearance, and no low range, I was really impressed with how well they did.. In the loose ricks they were fine, just when they were lifting tires.. then the stacking started..