Worked on this over the weekend. Towed the trailer to my house 8 miles away, felt each hub and drums and the one that was running hot was only hot on the outer part of the drum so the cause is the brakes and not the bearings (yay!). The rest of the drums were pretty cool.
Jacked up the problem wheel - no power and it rotates freely, no drag. Applied power and the wheel locked up. Repeated for all other wheels - same thing.
Went ahead and adjusted all the brakes all around, the problem wheel didn't adjust any differently. Drove back to ranch, applied the brakes a lot. Got there and the problem wheel was HOT, the rest were less than warm.
Background: - I put in all new brake assemblies and bearings/races a month ago. Turned the drums but not the magnet portion as that surface looked good (and could not find anyone that could turn the magnet surface) HOWEVER one of them once upon a time the grease got loose and was baked onto the magnet riding portion. I cleaned it very very well but I'm guessing the problematic wheel is the one that got this drum and there is still some contamination there causing the magnet to stick better than the others (my braking controller is only set to 3.5A for a 4 wheel setup - pretty low I'd think).
Guess I'll pull that drum and see if I can clean it some more, maybe take a roloc disc to it and if it's still a problem, replace that one drum.
