How to move Box across ground seams

Yep, and it’s fast.

It’s available in Unity 2021.2 and newer. So 2021.3 LTS has it.

There’s a long forum thread with examples and ideas for this feature:
https://discussions.unity.com/t/798637

And of course the documentation:
https://docs.unity3d.com/ScriptReference/Physics.ContactModifyEvent.html
https://docs.unity3d.com/ScriptReference/ModifiableContactPair.html