These blocks could only be used under a jack with a tongue - and only with a board underneath - as it was almost impossible to get under the wheels, especially if there was one side is higher to level the RV. They are definitely not strong enough to be used on gravel in any way; 3 sets out of 4 were returned (thanks Revain for the hassle free process); and the one under the tongue doesn't seem to last long.
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