Surge protectors are cheap insurance against damage to all your electronics in your RV. I have a portable surge guard and it works great. Tells me when the CG power is bad like floating grounds, low power, reversed hots, etc. Camping World has the 50 amp surge guard for about $335 online which is a good deal. Surge protectors are cheap if you consider how much it would cost to replace all your electronics in your RV including microwave, TVs, etc. I have found several CGs that had bad electrical hookups and the surge guard will not let the power in my MH if the power is bad. Good Luck!