I used 4X4 to crib my car when changing my transmission, It was more sturdy than any jack stand. HOWEVER you must use caution when raising or lowering your car.
In the industrial machinery field I have seen machinery riggers move 20,000lb machinery using cheap 2X4s, If you spend some time and think about what your doing there is nothing wrong with using wood. People who use there heads rarely have accidents.
In the industrial machinery field I have seen machinery riggers move 20,000lb machinery using cheap 2X4s, If you spend some time and think about what your doing there is nothing wrong with using wood. People who use there heads rarely have accidents.