There are no trespassing signs everywhere. So, I talked to the policewoman on duty at the trailer and she said that it was legal to take photos from the road (which I expected), but to not step on the grounds. There was one patrol car parked there. The trailer is fenced in with K-9 warnings. While taking pictures, I noticed at least one other park police vehicle pass by me on the road, and a couple PG county police cars. Waved to one of them. He waved back. This was between roughly 3:30-4:30pm. Bottom-line: I think security is pretty tight there so don’t press your luck. Have no idea if they do have night vision, cameras, and/or motion detectors, but would not rule them out. Hope I got some good pics for my photography course.