One nice day driving in town, I must have run over a nail or some other sharp item. While stopped at a light, I heard a hissing noise. I pulled into a flat parking lot to investigate - suspecting I had a leaking front passenger tire by the way the GMC Acadia was driving. I removed the jack and spare from the back of the truck and also the manual from the glove box. Following the instructions not only printed on the jack, in the manual, but also the underside of the vehicle - I placed the jack, made sure it was steady, and proceeded to jack the truck up. The jack collapsed under the weight of the truck. The emergency brake was set. I took every safety precaution especially because my sons were with me and they are teenagers (new drivers) so I was trying to emphasize the safety issues - lucky for me !!!! they are the ones that yelled that the truck was coming down. The design of the jack requires at least your arms to be underneath the vehicle to jack it up which is very unsafe. Fortunately for me, I don't ever work underneath a vehicle unless there is someone else capable standing by. The entire jack was bent sideways - unusable. My opinion is that the jack points on the frame of the truck are correct; however, the material that the jacks are made from is subpar. Although the dealer replaced the jack free of charge -- I won't use it. I could have lost my right arm the last time under ideal circumstances. I won't even take a chance that it's the same jack material next time. What if it were to happen on the open road in the rain where you had an uneven shoulder?

- Mt Laurel, NJ, USA