Checked out the Dually Discussion, Wheels, Tires, and Brakes, and some searches here but not finding what I am looking for, at least not for my year of truck. Looking for advice/knowledge on replacing the rear brake rotors on my dually. I know there are Youtube videos and such out there but...

I just finished putting new rotors on the rear end of my F350 SD DRW. they only had 6000 mi on since last change. Both had runout in excess of .010. Pads only had a small amt of wear. The truck sits for weeks at a time between use, Buffalo, NY weather. Is there something I should be doing...

Does anyone have a simple way of figuring out which rotor is causing brake pulsing, short of taking each rotor off and checking each?