Registering a truck camper

I always find it amazing at how the different areas treat a TC. In my opinion it's not a vehicle because it doesn't have wheels. Where I live in Indiana, it needs to be registered.

No. You don't need to register them in Ontario. To them it is just cargo in the back of the truck.

When internet is hard to substitute source of information , it is hard to confirm everything you read on it.
For questions like that I would call appropriate DMV and as them directly.
I bought my TC in Minnesota with a title, while in California TC are cargo and nobody wants to register them.

No, not in BC. They are not a vehicle so don't need to be registered but I would purchase an insurance policy for it as it will not be covered by your truck insurance.