Does anyone know where I can get an adapter (online preferably) that will connect a 30amp twistlock style cord to a regular (2 post+ ground) powercord? I have 2 of the same cords but I would like to connect them together. They both have one female twistlock end and one male normal style end. Option 2 is to build my own from hardware store parts but I was looking for a manufactured one as my first choice. The local RV dealers don't have any suggestions.