Originally Posted by bdornbush
"Yes, just seven minutes."
As can be seen in It Takes a Thief
, seven minutes is lots of time... to steal from your house, and a trailer should be faster.
Originally Posted by ice-breaker
Build as high of a fence around your property as is allowed by local ordinance...
That seems like a good way to me to reduce the chance that your trailer will be noticed, but unfortunately it also gives a thief the privacy needed for the theft. Also, any non-folding travel trailer is taller than the tallest allowed fence in many places.