Anyone had this condition before?

We have a Keystone Cougar that we bought new in January and love so far but the other day while in the driveway prepping for a trip I discovered something very strange. While the electrical was hooked up to my house (15 amp) to run the fridge and charge the battery a little I was inspecting the outside and washing some bug spots off the trailer. While my hands were around the bottom of the frame area I could swear I felt a little electric current, like a really weak electric fence. Not alarming but enough to get my attention. I also felt I could detect it when checking torque on the lug nuts when the wrench was on some of the nuts, and when putting the adnode (sp?) rod into the water heater. How big of a deal do you think this is? I'm calling the dealer soon anyway since it is under warranty just to bounce it off them but I figured I'd see what you guys thought.