Small Mobile Nvr For a Truck

I have a client who allows employees to take a truck home, and wants to see what comes out the only (roll up) door in the back at night. The truck is on the road a lot doing service calls for plumbing. I don't need GPS, just a way to get in and out of it quick and retrieve a data card with the last few days video. I thought I might be able to install a splitter on a backup camera and use that data, but I believe I need to have motion detection in a very limited area. Otherwise the travel on the road will eat up all the storage. Suggestions for small covert with ir invited too please.

Ray

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