So let me get this straight...
You are driving down the road, towing a trailer with your truck. There is a car on the trailer. The police pull you over for a routine check. No reason to pull you over. No visible loose tie downs, chains, low tires, bad lighting. They just pull you over to check. You are a private hauler, not a commercial vehicle. They just pull you over to check. And they climb up on your trailer, take your VIN number from your car and run that, too. No reason, other than to check. And some of you have no problem with this?
Well, then, you wouldn't have any problem with them walking up to all the vehicles on your driveway, maybe walking around the side of your house and checking the VIN on the un-plated truck you have back there behind the garage, getting the VIN numbers and running those, either, would you? Heck no. What's wrong with that?
I have two words to say about that....
Papers, please?