I have a 50A portable and I simply close the breaker box and install a padlock in the hasp on the pedestal.
I have only found one place that I was not able to lock it and all the people looked honest, so we stayed anyway. LOL
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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"It's easier to fool people than to convince them that they have been fooled." - Mark Twain