Check those boat trailer bearings! Even though I had greased mine, one came apart on the way home last weekend. I had stopped at a gas station and saw grease slung all over one of the wheels. Didn't take long to realize that the bearing was gone. I told the son-in-law, let's just go in and get some chicken, give it a little while to cool off, and we'll change it out. Yes---I did have two extra bearings in the truck. After a few minutes, we jacked the trailer up---under the station lights---changed out the bearing, and were back on our way in a very short amount of time. I'm sure glad we stopped though. If we had gone further, we probably would have lost the entire wheel. Smart thing---keep some extra bearings with ya---along with the right tools to change it out. (Experience is such a great teacher)