As has been mentioned before, it's often not about surge protection, it's also about other kinds of protection-- reverse polarity, and low voltage.
In my book, Progressive Industries makes the best. You can buy either a portable unit or one that is permanently wired into your rig. We have the hard-wired one, and it's saved our skin half a dozen times in the 18 months we've had our ACE, all from low voltage issues. You don't want your AC running without enough power.
Give Progressive a call. You'll be impressed with their passion and commitment to keeping your rig safe.
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