Airstream Trailer Lock
Sadly, if someone really wants it, wrapping a chain around the tongue and the hitch on the getaway vehicle will do the deed.
I'm partial to an alert neighbor and an NRA sticker on the fence. Won't go into the other tools I keep close at hand. Neighborhood armed security patrol is also very comforting.
If I personally owned the parking spot, my safety chains would be locked to an eyebolt or rebar arch buried in a few yards of high-strength concrete under the driveway. That would slow them down a bit.
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'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it