Floaters....... Wow , you have got to take care of your boats and trailers. This is almost the 2nd trip in a row that I have seen a trip sidelined to to blown out "bearings" on a boat trailer. Both times right at the boat ramp and absolutely ruining the trip. Besides the obvious routine maintenance, be sure you are not submerging your axles in the below the water line, this will help alleviate a lot of the issues. In addition, have the wheel bearing changed and serviced yearly, especially if you are hauling them a great deal of miles and heating them up greatly.
On other cheap piece of advice is to care a spare set of bearing and accessories in your tool box. Often times there are mobile mechanics you can find to do the work, but finding the parts on evenings, nights, holidays and weekends is another story. This can save the trip and a lot of money.