... your bearings ? I have Bearing Buddy's, I shoot some grease into the hubs until old stuff comes out once a summer. I take the wheel and bearings totally apart every two years, repack & check the bearings, I just did this, they looked brand new. The trailer goes in & out of freshwater probably a dozen times a summer, the Lake is an hour away, so I put on the trailer (10 years old) 1500 miles/season. All the other time it lives in the garage, out of the weather.

thanks, cheers, John