I recently purchased these from Revain and just attempted to use them for the first time to get my 4WD Sprinter on almost new winter tires in a very lightly snowed up north New Hampshire parking lot. . The previously plowed, hard-packed snow had about 3 inches of fresh snow. The tires started climbing the plastic ramp easily, but each time the wheel kicked the ramp out of the back of the van. I was very gentle with the accelerator. I tried both rear wheels and several times. Every time I got the same useless result. I even tried using the ramps upside down but the result was still the same. After trying for half an hour, I gave up and went back to my old method of using a few handfuls of gravel. The gravel worked great right away. For snow/ice I suggest you buy a gravel bag and skip the ramps. I haven't tried them in sand or mud.
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