Hi Mex,
Great link! Thanks. My opinion is still that brown outs cause far more damage than surges. Surge is a multifaceted word that has different meanings.
It can mean
Over voltage
Under voltage
spike
transient
and others I have not remembered or failed to mention
In addition 50 amp service needs to be protected from open neutrals.
All RV's need protection from incorrect wiring (hot and neutral reversed) and from a bad ground.
With what is currently available that means getting a top of the line progressive dynamics unit and an autoformer, too.
One can forget about protecting from a direct lightening strike, and probably about a nearby strike too. When that happens nothing affordable is available for protection.
Wiring should be checked before plugging in. It would be best to do so while loading the circuit.
My next purchase will be some kind of autoformer.