The jack in this e-bay link has a U shaped top that can be placed under the lower A arm outer lip in the front of your truck, or the shock mount on the rear of your truck. It has a nice wide base for stability. This is a stock jack from a mid-70's Chevy pickup. This post does not show the handle that you would twist to make the jack go up and down, the handle is long enough so you are not under the truck when raising it. Search for any year Chevy pick-up jack from 1974 and up, and when you find one that looks like this with the collapsible handle, you have one that will work with your truck. it will collapse down enough to fit under your A-arm, or under your rear axle shock mount. You can go to wrecking yards and find these also. They originally mounted to the inner fender well in the engine compartment of these trucks.
http://www.ebay.com/itm/81-82-83-84-...5Xp4~H&vxp=mtr