Have a non contact infra red thermometer with you to check the temperature of the wheel bearings. It is an excellent, and cheap, tool to determine if you have a dragging brake or a HOT bearing. Also I always recommend to boaters to check the temperature of the bearing before launching the boat. Nothing is worse for the bearing than to submerse them in cold water. That rapid cool down draws water past the seal and in the bearing area which leads to water contamination of the grease and rust in the bearing.
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