I've used those metal ones. They pre-date not all, but most fwd. They are not fwd friendly.
I've had a fwd spin and pull one ramp under the car. Or fail to climb it. I just don't like them.
Such ramps date from the late 70s, slid around, and were not so great even with RWD. They just slid forward, instead of back.
I have a set, but I use them as substitute jack stands, and have reasonable confidence in them.
The steel designs that lack any sort of bracing are the ones I'd worry more about collapsing. You know like how egg shells are stronger end to end, than laterally?
Like these, and other similar designs:
4000 lb. Capacity Solid Steel Auto Ramp Set
Amazing deals on this Solid Steel Auto Ramp Set at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
Got a chuckle about how one of the review pics shows somebody put cinder blocks underneath them. Not a bad idea, even for the old ones. Look at the examples in the one star reviews that didn't.
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