I have no experience with bearing buddies. Could your brake controller be adjusted too tight? Are the brakes dragging?? Having had bearing buddies on a boat trailer I found that it was difficult to adjust brakes with grease packed in the hub with bearing buddies. The grease just added resistance and made it harder to feel the brake drag. This is hard to describe as it is a "doesn't feel right" thing. I would try going back in and backing the bearing off just a little bit. Better a little loose than too tight. You could try disconnecting the brakes and try towing it and see if it still heats up. If it does, it is the bearings. If it does not it is the brakes.
Larry and Lou
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