We use one of those 30 amp surge gaurds on our line. Won't plug in without it. Have not encountered an interuption yet though, but if the outlet were wired wrong or otherwise had a problem, that surge gaurd would detect it for me and shut off before tripping the breaker...
Food for thought. Available through Camping World for around $90 I believe.
http://www.campingworld.com/browse/s...H&tcode=37
Gregg