A few years ago I bought a used 5x8 Ft. stake rack trailer for our annual Elk/Mule Deer/Antelope hunting trips out west. Leaving Michigan it's pretty much empty except for a chest freezer. On the way back though it's loaded to the gills right at max capacity. On the off season it seems to be constantly being used for all sorts of misc. stuff and being loaned out to friends and family. This little trailer has seen 4 round trips from Michigan to Colorado and Wyoming and countless trips within Michigan. When I bought it, I replaced the bearing, hubs and tires and I installed bearing buddies just so I can be assured that fresh grease would always be available for the bearings. My question is. How long should I expect these bearings to last? Should I replace them soon or will they last forever if I take care of them?