||A local mechanic, whom I went to school with.
Smart guy, owned a heavy duty shop, was into CNC machining. Had a old pickup on cribbing/stands in his home garage for years. Fell off and killed him this fall.
The 1/8" wide bottoms of those jackstands bearing on crap softwood is a disaster waiting to happen. Would be different if you had the jackstands welded to a steel plate sitting on the cribbing.