I know that the OEM ones do, and very quickly. If I were to replace them, how long would they last? What if they were from OME, Rubicon Express, BDS, Zone, Rough country, etc.? Would they sag as quickly? And I've heard that longer shackles make them sag faster, but what about say a 0.5 inch lift shackle (if they even make them)

Thanks!