OK E&J, I do think your wheel hub temps seem to be on the too high side. I don't like to see any temps higher than 140 degrees. If you cannot hold your hand comfortably on the hubs for 15 seconds, the hub is too hot. And if too hot the grease may start to thin and could run past a seal. Maybe your bearings are a bit too tight?
I mostly tow my trailer in Florida and at highway speeds. Wheels operating in the sunshine may get close to 140 sometimes. In the shade they run cooler.
Most newer brake controllers will advise if there is a disconnect or an electrical problem with any one brake. They will give a warning message.
