A few people here saying you are only lifting 1/4 the weight. If you put the jack under the axle as close as you can get it to the tire, you will find it will lift a significant amount of weight off of the other tire as well. Particularly true on a dually. The jack is going to be about 1/4 of the track inboard, at best. That will increase the load on the jack by 33%. In addition there is roll stiffness in the suspension which will load the jack further, any anti-sway bar further still. If the wheel has 3000 lb load your jack may see 4000 or even 5000 lbs.
