I always check the hubs at every stop while towing. If you have a temp gun that is great, if not just feel them with your hand. They should be warm after highway towing, but not hot enough that you can't leave you hand on them Compare the two sides. They should be about the same temp. This is also a great way to check for dragging ( misadjusted) brakes. Do some searches here as there was a discussion where users posted actual hub temps after towing.
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