When we took our first 'van to our first site two years ago, we noticed another 'van hitched up ready to leave. It had a piece of some sort of white cable cover/insulation 'stuff' that was slit diagonally round and round its length so that it was slipped over both elaectric wires and kept them both well off the road without them being tight. I've seen lots of other people with their electric wires done up in some strange ways and some looking quite foolish. Does anyone know what this white cable covering is and where I can get some? It doesn't have to be white.