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Many people have written about having problems with the block sliding and how they've gone about trying to add grip/rubber to the blocks to keep it from sliding in front of the wheel. We attached a rope at the leading edge of the block after drilling 2 holes in the plastic. We then lay the block down with the rope at the front of the wheel. When the trailer wheel pulls forward, it holds the rope, which in turn holds the block, and therefore you don't have to worry about the leveler sliding (regardless of what terrain you're on). While you're at it, attach a rope to the grey chock, too, so it's easier to grab.