Honestly having always run a torsion bar lifted IFS rig i wouldnt wast your money on a "Leveling COG" The torsion bars are generally mounted right up next to the frame on the a-arm so they arent traveling a lot in the first place. When the torsion bars are cranked you are still have the exact same amount of travel you just moved the static position of the a-arm... for example you crank 1" you loose 1" of downtravel and gain 1" of uptravel. So despite where you crank the torsion bar to it shoudl still be in a position that the engineers at the factory aproved the torsion bar to be in. With a slight torsion crank (enough to level a truck) the amoun teh torsion bar will move on teh a-arm side fromt eh stock position is so minimal i doubt it will cause any noticeable increased wear. Either way you lift an IFS rig your ride is going to get rougher. Much like lifting a TJ with short arms the force of a bump is transfered more directly to the frame the more you lift. Say the stock position of the a-arm is paralell to the ground, any force pushing up on the armcauses the arm to pivot, now lets say you lift the front and the arm is at a 30* angle to the ground, now instead of an upward force causing pure pivot motion more of the force is transmitted directly to the frame. So despite buying these "COGs" you will wind up with a very similar ride, and exact same effect if you just crank the torsion bars.
