At the end of the season prior to putting the camper away for winter I suddenly got a leak coming out of the rear of the TC. It was too cold to do anything about it so I drained everything and waited ...
Been around a lot of frozen pipes of differing materials. Freeze damage to pvc most likely would result in cracking the pipe or possibly breaking the bond at a weak connection. It wouldn’t widen any pinholes so to speak. If it froze and broke it would be broke.