has anyone changed the rear brakes on a OBS dually? If so is there any special tools I need before I get it all tore down?

 

a very big hammer to get the drums off a pair of vice grips are handy. other than that a pry bar, sockets, wrenches.......the ordinary stuff

oh yeah make sure the ebrake isnt on when your tring to get the drums off (dont ask)
little harder to get them off when the ebrake is on