If you have an independent RV repair shop nearby, I would take the switch there and they can possibly match it up out of a parts catalogue. Hallsville looks to be a small town so don't know if you have an RV shop nearby?
Maybe find a good electronics shop somewhere that sells all things to do with electronics. We have one here that is way better than a Radio Shack and carries a huge range of parts and components. You could possibly measure the switch and and send that to an electronics store like this along with some pics and maybe they can come up with something. It's very likely to be an industry standard dimension.
Another manufacturer of RV switches is
American Technology.
Or... Just replace the entire light fixture c/w switch?