The components are common trailer bearings and seals. We have a place that makes trailers here and they have all that stuff. Other places would be RV places and auto parts stores. You can also order stuff off amazon and etrailer.com. I would recommend you get a bearing packer and use some good Moly grease. This a cheap double cone thing that you sandwich the bearing between and pump it full of grease with a grease gun. Add more grease to the races and the cavity between bearings but leave some space for air and put grease in the grease cap. Clean stuff real well before packing.
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