I was pulling my batteries so they didn't get stolen with my popup. With my new trailer, I bought these :
http://b-drvbatterylock.com/
Batteries are always good for thieves cause they can either use them or get $20 for the core. Have seen some people chain their propane to the frame but I do not.
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2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away