I was considering the Andersen levellers until I read the reviews of them. It seems that unless they are on a dry solid surface, they have a tendency to "squirt" out from under the wheels as you roll up on them. One reviewer had so much trouble with them popping out that he said it took longer to get the levelling done than making several tries with 2x6's.
Another review showed two levellers that broke where the lightening holes go in.
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