I was putting Ebrake cables in the Rambler today when both jackstands and the bumper jack ( stands were supporting most of the weight ) kicked out with me underneath it. lucilly the side I was on had the tire on it and I wasn't badly injured because it did not really fall far ( 5-6" considering suspension travel ).. but I did just come back from the hospital, I have only bruises for injuries.... Now, I know having the bumper jack have any preassure on it and being under the vehicle is a nono... now I know first hand that care and saftey should be taken into consideration when crawling under a vehicle... You can learn from your mistakes but... you can also die from your mistakes... if the tire haddn't been on the car, I would at the very least be paralyzed... both the car and me are fine.. my dad jacked it back up and I quickley crawled out.