Tumbling over walls?

Jarvan's ult might as well not even be terrain. You can jam champs through it by just walking at it the right way.

Vayne can't tumble over walls or other terrain, but if you do it right, temporary terrain can be tumbled over I believe.

From the wikia, Temporary terrain such as Crystallize and Cataclysm can be moved over if Tumble can completely pass over it.

Player-created terrain is not the same. Anivia, J4, etc, can all have their walls Tumbled over by Vayne.