Hey, bit of an update here. While I am told we do not use security screws (at this time), I found out today that in the past, we have used them.
In the now discontinued Bighorn 3400 RE, there is a 42" LCD TV across the back of the RV. There is a massive 2x4 support structure behind the TV with a Peerless TV mount, screwed to the 2x4s. Then the mating components of the Peerless mount are screwed onto the back of the TV. The TV hooks onto the bracket on the RV and is secured by 2 screws. These screws secure the part of the mount on the TV, to the part of the mount in the RV. When cranked down, the TV will NOT move side to side and is kept from hopping off track while traveling.
Okay - here's where I eat crow. Two 4mm Allen head "security" screws! That's the 2 screws I speak of above in this note. Anyway, without the proper tool, these are difficult to remove. In this particular installation, a small vise grip tool could be used to grip the head of the screws to remove them.
So, why were these screws used in this case and will they be used again? I believe that they came "with" the Peerless mount and that's why they were used. A small wrench was likely included with the mount but may or may not have made it to the owners packets in the RV. I doubt we'll use these screws again as I don't believe we use Peerless mounts.
Jim