I agree this is a worthwhile investment... My 'whole house' surge supressors (brick and mortar home) have saved me multiple times (giving their life in the attempt on 2 occasions) - so installing in the RV was a no-brainer...
I went with the portable model (Surge Guard 50A) - as I didn't want to add to the 'hum' under the bed (where all the electrical is) - and wanted something I could bypass easily if IT failed for some reason (old models of Surge Guard had a bypass - but they eliminated it on newer models.)
I chain it to the power pedestal - someone would have to cut lock/chain/cord exiting unit to remove... Certainly can be done - but can't just unplug and walk away.
I believe it has already saved me $$ in repairs - as we ended up at a park in August that had a low voltage issue on the leg I was on... It 'protected' multiple times and was enough to convince the camp owner he had a problem.
Only issue I had with choice of a portable unit was a recent park where the electrical boxes were almost horizontal just above ground... The Surge Guard has to be vertical to be waterproof (per the label). I may need a short 50amp cord to give some flexibility if I run into that again.
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