Nothing wrong with throwing a wheel under there as a second or even third backup. Even when using jack stands, I keep a floor jack tensioned under at least one jacking point. Who knows.

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

Always a double safety catch. Triple if possible. Nobody ever got crushed under a car from being too careful. Many have bought the farm not being careful enough.

I know from experience it is possible to accidently kick a jackstand out from under a car. Thankfully, no one was injured, just scared as Hell.

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1983 300SD "Guderian"
1987 MR2
2015 Camry
2015 Chevy Spark
2006 Hyundai Tucson

I have been working on cars since age 14. I'm pushing 60 now. I have never been all that careful, but here's a scary story. I live in NorCal. I was at a yard out where all the yards are by Watsonville, getting parts off an old Jag that was supported only on loose rims under the body. They were NOT bolted to hubs. They were on the edge holding up the body like a jack. I worked all day getting the parts I needed. I drove home. Parked. The Loma-Prieta quake happened about 10 minutes later. I have no doubt I missed death by about 45 minutes. Am I any more careful? Naw, not really. Perhaps I do get out the jack stands now, if I think I'm going to be "down there" for a while.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson

Ditto, I've had to do a couple of emergency parking lot replacements of a starter using a tire changing jack. A spare tire, placed in a critical spot, is a great backup that will at least keep you from getting crushed.

I definitely agree with the shake test, as well. Sometimes the eyeballing of jackstand placement is a little askew when you lower it in place.

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Sam

84 300SD 350K+ miles ( Blue Belle )