I watched the NASCAR guys in the pits/garage area adjust camber at Bristol back in the 90's. Apparently, they learned additional camber in the rear was a plus, but because it was causing axles and rears to fail, Nascar put a limit on it. Some with too much were forced to adjust before they hit the track. With the rear in the car, they heated one side of the outside axle tube cherry red...then quickly cooled it with ice cold (HOLIDAY INN ) towels to draw the it within rules .
I was amazed at how quick the fix was.....those boys did not screw around.