Thanks for the input ols1932. The external unit makes most sense to me since it's easy to move when you buy a new trailer but I was concernned about theft. The dealer had shown me a lock which only locked the unit to an extension cord. Problem was you could steal the extension cord and the surge guard then.
I don't recall anything on the body of the surge guard that you can use a padlock on. It's been a while since I've seen a "real" unit. How do you padlock it??
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