When we were in SD this summer on our trip-we noticed that the cap to our water tank either shook loos or was stolen. Does anyone know how to find a replacement for this? It's the kind that threads closed. I called our local dealer but they stopped making those. I trie to call Forest River but was told to find a local dealer. Does anyone know of a place that carries extensive parts? Used parts? I haven't found these at camping world online either. Thanks for your help-foil is covering it now!