I know this is a little off the topic, but I stay frequently at Thousand Trails Pio Pico in Jamul, Ca. (I'm there now). Jamul is in the San Diego area about 10 miles East of Chula Vista in rugged hill country. All of the land to the South is part of a large "nature preserve" that goes about 6 miles to the South to the Mexican border fence. There are no paved roads South of the park to the fence, although there are some "truck trail" dirt roads and foot paths through it. You can count on 3-4 flyovers every day by Customs and Border Protection helicopters (I don't know how many planes), and seeing 3-5 CBP vehicles on the 7 mile drive to the Chula Vista Eastern district (some of these vehicles with flat panel radar pointed to the mountainous hills to the South). I have been awoken in the middle of the night seeing CBE vehicles going up the primitive truck trail that starts right at the RV park IN THE RAIN. There is a major CBP highway checkpoint on the Campo highway just a few miles East, where there have been shooting incidents over the years. I have regularly seen in shape CBP agents parking their vehicles and putting on military sized backpacks to hike into this large, hilly, area on foot from the roadway.
The good news is that with all of this evident smuggling and enforcement activity, I have never heard of any evidence of any associated problems in the RV park.