About a year and a bit ago I replaced my shackle bushes with polyurethane bushes, greased them well, etc. The bushes that came out of there we crumbs (they were hard yellow plastic bushes). Now I noticed bushes on the rear hangers of my hj60 cruiser are completely trashed. Quite surprised, thought they would last longer. Whats the current thought on bushes? Should I rather go for greasable shackles? My last camping trip saw the vehicle quite heavily loaded and the rear suspension bottomed out a few times. Any input greatly appreciated!