i never trust jack stands i always use cribs for safety ,,i know every one gets lazy or tired and and sometime takes a short cut ,but thats the one time it gets ya,,,i just had my pinky finger cut off helping a friend swapping truck cabs i had a pair of meta miner gloves but i didnt put them on ,,every one else had gloves then one guy said lets put some boards down in case it falls but everyone was in a hurry and it slipped and my finger was under the cab and between the frame ,,luckily they reattached it..but its so easy to get hurt,,be safe guys...