After travelling thru some sketchy parts of the country, We looked at this idea about a year ago...
On our Seneca, we are just as vulnerable (if not more so) for someone to enter our rig thru the drivers / passenger doors as we are the main entry door. If someone is wanting inside of our rig, they are going to have to get past our three dogs first (80/75/70lbs) and they leave you plenty of advance warning before you even get close to the Seneca.
For the rest of the time, when we and the dogs are away - we opted for something that covers the general interior for all of the doors.
We went with one of these:
https://www.homedepot.com/p/GE-Perso...207/100685862?
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Steve & Stacy with Jasper (Australian Cattle dog)
2015 Seneca 36FK
Custom 27' flatbed trailer hauling:
07 Toyota FJC & Yamaha Kodiak 400 ATV