Car Ramp Rockets- Keep from sliding???

I was given a couple of car ramps and was going to use them to change my oil. When I attempted to drive up them, they slid forward both in my garage and then again on the driveway. I was able to drive up them when they were placed on an unpaved area, but they sunk in the dirt a little and looked unstable. I am sure there is probably a simple solution to this problem. What's your trick to keep them from sliding forward? Thanks/Jeff

Sure....cut two sheets of plywood, slightly larger than the ramps themselves. Put the ramps on the wood, and they are less likely to slide aroung on the paved floor.

Also, NEVER get under your car with the ramps on dirt, if you are interested in seeing tomorrow.

In fact never get under any car on any kind of jack or ramp or lift on dirt or other soft ground.

I learned the hard way and only narrowly missed being flattened by a rally car.

An addition to the plywood idea. One that i used was to cut strips of ply about 2' wide at full 8' length. Put the ramps at the far end and use little strips of plywood screwed down to hold it in place. By the time your front wheels get to the ramp hopefully your back wheels will be on the ply and the ramp can't go anywhere.

In my dad's shop he drilled two 1/2" holes for some 3/8" cement anchors. He bolted two pieces of 2x4 to the floor. For FWD, he puts the ramps on the far side of the 2x4 so they can't get sucked back under, and for RWD he puts them behind the 2x4 so they can't get pushed away.

On RWD I've also seen guys tie a rope to the ramp and string it back under the rear tires. As they go up, the rope holds them in place. Otherwise, good luck. I ended up building some wooden ramps. I took two 10' 2x10s, cut them into 4', 3', 2', and 1' lengths and screwed them together in steps. Its solid so it can't collapse, and your rise is only 1.5" every foot, so its easy to ramp. Of course, it only gets you up 6", but its better than nothing. You could buy more pieces and make more steps, but I'd be tempted to jump to 2x12 and for the ultimate, get some rough-cut oak from a local mill for supreme sturdiness.

In all seriousness, the solution is to put them in a dumpster. Get a jack and jack stands. They are dangerous at best and deadly at worst. A minister near here was crushed when the ramps failed! And as an added note...don't use cinder blocks for support either, they will break.

All of the advice is appreciated.

Since you were in your garage, you could just put a 5 or 6' piece of wood from the backside of the ramps to the base of the wall, that way when you started up them, the ramps would push against the wood, the wood against the wall, which hopefully won't move. :)

Thanks again for all the replies. At this point I am going to take benchtest's advice and just get rid of them- they were given to me anyway.