Many people do, but you are taking a risk. I have used them to lift, but put 6x6, 4x4 platforms under the I beam and then a 12 ton jack stand. I let the stand have most of the weight. I have the wheels locked on the opposite side and the front hitched. Safety first. I didn't live this long to risk what is left.
Remove the tires, clean, and inspect the bearings along with the breaks. Manually repack the bearings. You can purchase a bearing greaser which makes it easy. Make sure you have a torque wrench to torque the lug nuts.