Not Ranked
Instead of lag bolts, I attached the 2"x12"(s) to 1/2" OSB (with a 45 degree bevel). The OSB is about 12" longer than the 2"x12"(s) and screwed (thru the bottom) to the 2"x12"(s). The OSB is so low that when you drive up on to that part of the "ramp" it will not slide. Once the weight of your car is on the OSB (only), then when you go up the 2"x12"(s) they cannot slide....at least mine don't.
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