After getting sideskirts and coilovers it was impossible to get my jack under the front of my car. I used single 2x4s however when jacking rear of car needed to remove the 2x4s as the car would slide forward. With the Cusco ramps it also doubles as a wheel chock. They come apart in 2 peices so you can remove the ramp portion to get your jack to the pinch point or frame rail. There is a 1/4in price of plastic thats maybe 6 inches long that you just roll onto and the ramps and they stay still. I had the 40$ rhino ramps that are 6in tall (vs the 4in Cusco) from before i had suspension work. Those ramps didnt get cloae to getting under my car.