I'm very paranoid working under the car. I always have 2 support methods as well as the jack. I have jackstands, but I also have hardwood blocks I've made up, probably 12" x 10" x 2" thick, stacked to whatever height I need under the frame rails. I think I trust them more than the jackstands, as far as I know the quality of wood hasn't declined in the last 30 years like steel has....
