I can't believe any mfg would make a solid connection tween the wax flange, and the tank. My flange has a 6" long pipe glued into it, then pushes thru a rubber tank bushing, then screwed to the floor. Any changes made to floor or carpet, the pipe simply moves up/dwn inside the bushing.
WhenI got my MH, the turlet and flange was mounted on top of thick carpet and pad,.....wobbled around like a fish outta water. I marking pencil'd a line all around the turlet base, removed the turlet and flange, cut out the carpet, then screwed everything down to the solid floor,.......no more wobble !! The pipe in the rubber bushing was a godsend. And the dealer says those "pipe in bushing" never leak.