Just from recent experience.......
I had a strange noise when moving real slow from the left rear wheel.
But only with it on the ground, jacked it up,... NO NOISE.....
I thought, Oh Dam, a axle bearing is going !!!
Ordered all the parts including the backing plate upgrade kits.......
Went to start tearing things down....
ONE OF THE BRAKE DRUM MOUNTING BOLTS (4 small bolts in center) WAS NOT TIGHT!!!!
It was snug, but did not "Krack Loose" like the other 3. Tightened it up....Noise GONE!!!
Oh Well....I am now $135.00 light and inventoried up to build a set of spare rear axles to take along !!
CAPT