I had the experience of plugging in to a supposed to be 30 amp 120 volt RV outlet at a campground with a almost new trailer. Found out that a electrician had spent the winter at that site and had just departed that day. The campground owner said he didn't know he had rewired it but it didn't do much damage. I came in after dark and the outlet was close to ground so plugged in and was visiting with a friend for 30 or 40 minutes before I knew anything was wrong. My son said the little nite light was real brite and when he turned his tape player on it played real fast for a second than made a pop sound and quit working. The only damage was refrigerator heating element was burned out, ground fault outlet burned out and sons tape player borned out. The power convertor breaker was tripped but was ok. When I went to unplug from outlet, I took a flashlight and notice a little wrinkled tag that read "this outlet has been changed to 220, good luck". I had the trailer for about 9 years after that and no other problems ever showed up.
