Progressive 412's Life span?

[ValkSmile]

Does anyone know how long a set of Progressive 412's should last? They are on my wrecked I/S and I want to put them on my new I/S. I see some leakage on one of the shocks on my new I/S. I dont do a whole lot of 2 up riding and I only weigh in at 180 so I dont think they have taken too much abuse. What about the Progressive front springs too.

[larryh0841]

My first set lasted only about 20,000 miles before one started leaking.  I have about 50,000 miles on the current set with no problems.  11 1/2 inch HD.  I almost always ride two up.
                                     Larry