No matter what type I am using I also back up them up with a fail safe system...I use inflated tires on rims....double stack them and you will be safe....use at least 2 sets and you can use this system without jack stands, you car will be about 14-16 inches off the ground and much cheaper and safer than jack stands. I sometimes use them depending on where I am at with and without jack stands. I have a couple sets from SEARS that I got with a sale on a hydraulic JACK and sometimes WALMART has jack stands and all are safe using the tires as a back up....Jim

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James A. Harris