[GWN7]

That's a hub. The one on your trailer is ok. All the hub does is hold the bearings in place and hold the wheel on. You need a bearing set. I just did my car hauler's bearings. The kits are about $30 But before you do that check the axel to see if it's scored. Clean all the old bearings off the axel. If the axel is scored it will wear out bearings prematurely. If it's badly scored it should be replaced. Axel's start at $180 and depending on their length and weight rating go up to $700.