I can only echo the sentiments expressed above. We've been doing this FT thing for many years. Do your homework and go to parks with clean records. They're out there, usually well off the beaten path and largely inhabited by seasonals.
Case in point, we are currently in a small(50 site)park in North Central FL. All the amenities that we require (great WiFi being the priority). Their (verified) record is not a single reported theft in 21 years). Again, do your homework. After that, if you choose that venue and when you have been there a few days you don't feel comfortable, your rig has wheels. Use them.
If you feel the need for a security system, you are in the wrong place.
Happy Travels