Go to Walmart and buy the least expensive rubber backed bathmat that you can find that is at least 36" long, 48" is better. Slit it lengthwise. Put 1 section under each Rhino ramp, rubber side down, carpet side up. Wedge the edges of the ramps up tight against each tire before you start to drive up on them.
I use them only for oil changes, but the ramps work fine and the bathmat keeps them from slipping on a slick concrete floor.
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