Our dealer removed and reinstalled our drums for a brake & bearing inspection at our request. Away on a road trip, I found one of the drums was quite a bit hotter than the other using an IR gun. When I removed the drums myself at home, I discovered I needed a wrench to undo the castle nuts and because they way over-tightened. They were also supposed to cleaned and repacked the bearings but I found 2 colors of grease inside so all they had done was pump more grease in via the zerks. Just can't trust a dealer to do anything right. :M
I decided to replace the original Chinese bearings with Timkens and no issues after several years. You'll know pretty quick when you go to remove the castle nuts if they were installed correctly or not.
Note that the drums can seem hotter on one side if travelling down a road with the sun hitting them and the other side being in the shade.