I would like to know if
Rigidbody2D's can detect collisions with 3D Box colliders and/or normal
I seem to have a problem where my
2D Colliders don't detect collision with my
3D Cubes. :/
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No, the 2D and 3D physics worlds in Unity are treated completely separately, using different internal physics engines (2D is using Box2D, 3D uses a variant of PhysX)
If you need 3D physics, then the simplest way is to handle all of your physics objects as 3D, with appropriate constraints to keep the 2D objects from rotating out of their intended viewing plane.