Thanks so much, Ken! I'll get a pic of the VIN number shortly.We run into this on the boat side more often. There are many boat builders that are not listed in NADA. If not listed, banks can't find a value and they often hesitate lending money for the purchase. They don't like "guessing" for a value. This often limits the sale to a cash buyer. Being in NADA does cost a manufacturer money and there is some office work to do in maintaining the presence there.
In the RV world, most builders are owned by a larger company so following to the top of the food chain can help. For example Montana. If you enter Montana in the BUILDER search, nothing comes up. Enter it in the MODEL search and all 15 sub-models show as does Keystone, the actual manufacturer.
It can be like following a rabbit trail. As mentioned, a picture of the VIN tag could offer a bit more info.
Let me know how we can help.
Ken