You're very lucky. A little over a year ago my co-worker lost her husband due to a similar accident. He was working on his truck, and did even better than jack-stands---he parked it over a ditch and crawled beneath. Somehow, something went wrong and it rolled on top of him in the ditch. There was obviously no way he was getting the tire off of him, supine with it on him, "chalked" in the ditch now. They found him like that when they got home.
No, I don't know exactly what occurred (parking-brake, transmission popped out of gear, whatever). I have no idea. I just know the general details, as I didn't feel like grilling his widow about it.
Be careful.
|