Hello,
This is my "train of thoughts":
Security is always a compromise between security on one side and convenience / practicality on the other sie - it doesn't matter what it is (house, car, computer etc.).
You could make it so secure that it is very difficult for the user to actually use it - but hey, it is secure.
This bears a risk. Because if it is not convenience / practicality the user would not use it and turn something secure in something very unsecure.
Because of this a compromise needs to be found to ensure that security is user friendly and practical, even if it means that the security is, well, less secure. But in this case the user will use it and therefore increase the security.
I don't have a bear lock, but I have the Pandora Camper Mini installed. Part of this is that a "token" has to be present before the car starts. I am rather happy with that. Why?
Because whenever I am not with the camper it is rather difficult to start the car (and I am sure modern car thieves have their ways around the standard car manufacturers security setup).
Do I have the "token" and the car keys together, yes sometimes - but not always. This increases the security.
Of course the Pandora Alarm can do so much more, the main thing is that it is convenient for me to use and because of this I use it. With this I can achieve at least 80 % or more security. That is good enough for me. It is possible to increase the security but 1.) this will cost a good bit of money and 2.) it won't be that convenience / practicality.
Therefore I think bear lock is a good way to increase the security of the camper, but it is not 100%, which make sense because 100% security is not possible.
Reasonably secured Grand California
Eberhard