IF the springs arent sagging replace the bushings. I think Rustys sell replacements. Do you have shims?

As far as RE. I remember back in the day the talk was RE or nothing! I hate to say it but I've heard and seen pictures of the sticker that says the leafs are made elsewhere.. I recently picked up a pair of new in box RE 5.5 coils. The guy bought it a year before RE "reorganized". I'll see if it will out last the Rustys 4.5 coil.