I have never had a problem at Oakridge and feel very comfortable launching and parking there. Thieves for whatever reason do like to help themselves license plates and it happens fairly often. I've lost two in the last four years and it's always at Monticello. Each time it was bracket, light and all. I try to think better of people and really wonder if some of this can be attributed to road hazards or other gremlins at and around boat ramps. Most boat trailer LP brackets along with mine are mounted fairly low to the ground and I can't help but think a fair percentage just get knocked off.
I have lost a couple both times it was due to backing into the water and getting broken off. I fine you lose a lot less if you put the LP or holder on hinges to swing. I do hate it for you if it did get stolen. I guess they don't want to pay for new ones LOL