The manufactures saying only 2 stands is nonsense. I feel completely safe.
Just got off the phone with the manufacturer of a well known, frequently used jack stand manufacturer and the representative of the manufacturer disagrees with your opinion, as I do.
As per the representative, the practice is a definitely a safety factor and the jack stands should not be used in this way.
The safety alert symbol in directions is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.
Failure to heed these marking may result in personal injury and/or property damage.
From Directions:
WARNING •
Study, understand and follow all instructions provided with and on this device before use. • Rated capacity is per pair! Do not exceed rated capacity. • Use only on hard, level surface. • Center load on saddle. • Use as a matched pair to support one end of a vehicle only.
One pair per vehicle only. • Jack stands are not to be used to simultaneously support both ends or one side of a vehicle. • No alterations shall be made to this device. •
Failure to heed these markings may result in personal injury and/or property damage.
You feel safe??????????