Anybody have a ball park figure as to how long the shocks and or springs hold up on an Old Man Emu suspension/lift? I installed mine in 2007 and coming up on 100,000 miles driven with the lift. Of those miles 40,000 of them was a pretty much maxed out load. It is the medium 2 inch lift by the way. I understand that OME has come out with a new sport shock since- has any one had a before and after experience with those?