An alarmed RV in a secure storage facility only works if the first line security failed. And then, it may not deter the perp in a smash and grab.
Video is a nifty tool for the cops to investigate crimes.....but that only happens much after the fact. How far will authorites go, and how fast, with petty theft or crimes less than grand larceny? If they make an arrest, there is possible court time/testimony? Likely, the perp pleads out and you simply have an insurance deductible to pay. Many perps truly do not care if there is a security system.
I have not had any break-ins while my rig was in storage for about 20 winters, nor any break-ins where we camped, and have never had anything stolen from the campsite that was left in plain site.
Not camping and storing in risky places is a good idea.