Advice I've received said to stay away from Surge Guard products. I know from experience, Camco's top of the line protector is a bad investment. When mine failed due to water intrusion (it was never immersed in water but did hang outside for a month when it rained several times - it claimed to be water resistant), I called asking where I could get it repaired and was told it was not repairable. $250 on a non-repairable item doesn't sit well with me - never again. The Progressive line of protectors has a lifetime warranty that users say they stand behind.
https://www.progressiveindustries.net/our-products