Personally I would not do it, and would not recommend to other pilots to pilot a drone from inside a vehicle as a best practice for the reasons
@Chrislaf notes. I live in Canada too, so I get the attraction of being in a vehicle. I'm not passing judgement on anyone here that does either, just offering food for thought on the chat.
From a perception point of view, I only pilot where I have full visual of the site, where people can see me and I can see them and want to be seen as being accessible to anyone so they know who the pilot is, so I can answer any concerns and questions. I encourage bystanders to ask questions, engage them and promote that I'm just flying, not spying. I think this is a best practice for accountability and promoting transparency on a flight and drones generally.
From an operational point of view, pilots are responsible for their aircraft and safe operation to ensure public safety, including privacy in Canada. That means we need full site situational awareness - full VLOS and audio capabilities. We know metal does affect the control link signals too. We know to use the newer technology warnings as a supplement to situational awareness, but not rely solely upon it - technology does fail. Every pilot has a crash story - if not yet, it will come.
So, if I ever have a situation where a person, property or a manned aircraft was affected by a drone I was piloting, and police were called, or my insurer or (heaven forbid) a judge looked at the facts of the situation, I could say I was fully present, and I did all I reasonably could as the pilot to avoid the accident.
The issue in my mind is a pilot would lose that supportive argument in piloting from inside a vehicle. To what degree would be the question and open to conjecture.