I have a 1998 Hydra-Sports 196 with matching trailer. I bought it used 2 years ago. It has developed a vibration when pulling it down the road and one of the hubs slings grease like crazy (has done this since I bought it). It is dual axle and I want to replace all 4 of the hubs just for piece of mind (everything I've read says its relatively cheap). The problem is I do not know which hubs to buy. The only info I can find on the trailer is that there is a Hydra-Sports sticker on both of the fenders, so I assume it is a factory sticker. Any help would be greatly appreciated.