I'm admittedly a bit of a freak when it comes to my power management. I've assembled this setup over the course of 3 years to take the sting out of the money. But w/ all the electronics in my rig, I just didn't want to chance it.
Pedestal --> PI Surge Protector --> 12' 30AMP wire --> Hughes Autoformer --> 12' 30AMP wire --> PI PT30C (not hardwired) --> 3' pigtail 30AMP wire --> Coach
If its a surge, the cheap surge protector on the pedestal takes the hit.
If I have low voltage, the Autoformer will try to correct it and keep me running
If the voltage is so out of whack or the surge is so great that its more then the Pedestal Surge or Autoformer can handle, the EMS is there for mop up duty.
Its pricey, and probably overkill. But I don't worry at all about my electronics. Slide motors, awning motors, leveling jacks, fridge, furnace, etc. blah blah blah. I'm covered.
I didn't get the hardwired EMS b/c if the EMS fails for whatever reason, I just unplug it. I leave the pedestal surge unprotected (not chained or anything), I chain the autoformer to my leaf springs at the rear of the coach (and keep the autoformer under the coach sitting on 2 Lynx levelers to keep it dry), and I leave the EMS in the electrical compartment (locked).
2015 Greyhawk 29MV