There is two different frames on the E forklifts, and about 12+ different masts that are offered, all have a inner weight at 458 lbs and outer at 650 lbs with two extra weights as needed 146 and 218 lbs. All have a 23 gpm pump that is set at 2150 psi. The masts have several different cylinders that give it lift and the size changes as it extends. The load like said is rated at 24" out from the face of the forks or less, once past this it throws the center of gravity off. The center of the axle is the fulcrum, to the rear you have counterweight and machine weight and to the front forklift weight and load weight. Ground conditions, height, weight, changes in motion all are key factors in forklifts. The 586E is like the 580E and early k drive train, the 4wd axle is the big concern in the area of the steering upper/lower kingpins on the 4x4 along with u-joints seals. The other is heavy wear on the mast frames/chains/rollers. They are a good machine in the straight mast lifting. I would pull the trigger and by if it checks out good.