Used a friends trailer a couple of years ago to deliver a car from Fl. to Mn and as soon as I got into Mn. stopped for gas and saw a wobbling wheel. Took the wheel off at an Advance Auto parts parking lot and they did not have what I needed ,but there was a trailer sales place a mile up the road who had everything . the guy I borrowed the trailer from told me that the bearings were just packed so I did not check them as I usually do on any trailer I use. I pulled the rest of the wheels and they were all dry. A guy saw me working on the trailer and gave me his phone number and told me that if I needed help he had a complete machine shop at his farm a few miles away. Car guys usually offer assistance wherever you are. Lesson learned never leave on a trip without checking the bearings yourself.