LOUIS B HOLUB wrote:Suggestion: repack wheel bearings, ASAP. But, first, jack-up the trailer, spin the wheels and listen for any "grinding" sounds. If so, replace the bearings.
Actually, I've found you can't always 'hear' a bad bearing, though admittedly if they're really trashed you can.
I suggest, given you don't know the history of this boat, that you assume the worst and do a complete inspection and re-pack. So... if you're going to inspect & repack the bearings and do a proper job of it, you should remove the inner and outer bearings, along with the inner seal, and wash all of the grease off the bearings and the hub (along with the bearing races) with solvent. Once they are spotlessly clean, inspect the bearing rollers and the bearing races carefully for signs of scoring or deterioration ('flaking' or 'galling' of the surface of the bearing or race). If you see any signs whatsoever, replace the bearings and the races (they need to be driven out of the hub with a drift). Install the new races, pack the bearings with a marine-grade wheel bearing grease, and install a new seal.
Bearings are too cheap to risk having one go south at 55 mph on the highway, so when in doubt, replace 'em.