That is not how you hook up power to an RV at a campground!
Actually I'll guess from the photo that they were in a driveway or parking lot somewhere and got hooked on the lines possibly with the air conditioner on the roof. Looking at the lines they appear to be either power or telephone. I've never seen cable TV lines twisted around each other like that on a pole. If those are power lines they are most likely a feed for a building since having only two wires rules out the 3 phase found along main roads and also that they normally don't twist power lines together like that on a main road.