This kit contains everything you need except grease to replace bearings, grease fittings and dust caps on 4x8 port cargo trailers. My trailer in particular is a 1200lb capacity model, not a super heavy model, although I expect it will work on both and possibly others with 25mm axles and the same wheels. This is a quality bearing kit, the trailer rolls well and smoothly again. If you've never changed bearings feel free to lubricate them, they won't last long without a generous amount. You have to fill the bearings with it before installing it, and then I personally take a big handful of grease and stuff the hub cavity before putting it back on the axle.
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