There are many factors that can contribute to the hubs getting hot. One, as you mentioned is a lot of braking. Others are - but not limited to - not enough grease in the bearings, bearing adjustment too tight or too loose, bad bearings, too much weight for the bearings, mis-adjusted WDH that puts too much load on the TM axle. Those come to mind. It's hard to say which is the cause on your rig and several may be contributing to the heat. Even dirty grease can cause problems in this area. I am not a fan of the Dexter bearing greasing system and prefer to grease the bearings by hand since I ruined one set of brake shoes using the Dexter system. A good RV shop or mechanic should be able to determine what the problem is. When we picked up our TM the hubs were heating up and I determined that the bearings were too loose. I re-adjusted them and the problem went away. Hope this helps.
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