Am I the only one that is horrified being under a jacked up car? I’m not a mechanic by trade or school but always do all my own car work. I’m currently rebuilding my trans and hate being under it because it doesn’t sit far off the ground. It’s currently on 4 4ton jack stands and I always leave a jack under it but when it’s time to put the trans back I’ll be needing the jack. For reference too the floor is about 20 inches off the ground.
If you put the jack stands in the proper place and you’re on fairly level hard ground/concrete, you’re safe.