TenOC,
One surge protector per leg.
I do test for polarity and voltage under load before I plug in the RV.
I prefer an autoformer, so low voltage can be fixed rather than the power simply shutting off. I have safely run my roof air with shore power at 96 volts. Inside the RV it was 108 volts. The Sola Basic does both boost and buck.
There are reasons to use an EMC in a 50 amp rv. Get the top of the line unit from Progressive Industries.
The wiring path would be:
Pedestal, Autoformer, EMS, RV.
It appears that no one makes a stand alone EMS that doesn't include (rather useless) surge protection.
