Took off one of the drums Saturday and found several things...The brake shoes were ok, the bearings were almost dry and the D washer was warped in the center. I am assuming the people who worked on it last must have really tightened it down. They were suppose to have re-packed the bearings, but does not look like they did a very good job.
Several years back had the dealer look at the brakes. The Tech says that the magnet(s) was not working as well as they should on one or more of the wheels. They met minimum requirements, but would soon need replacing. I have had to crank up my brake controller to the max to get ok braking from the 5er. So, I am assuming they were right.
Even though the brakes were ok, decided to go ahead and replace all four wheel assemblies. To replace the magnets and for piece of mind if anything else. Have to re-pack all the bearings anyway, so figured it is a good time to do it. RV is 5 years old...should be good for another 5.
Assemblies were $55 a piece with free shipping from etrailer.com. Should be here Wed or Thurs. I know what I will be doing this weekend.
Thanks for everyone's replies.