2005 WW lite 26bh
I have a 2008 WW LE, model 28DDEC. We purchased it used in 2015. Like yours, mine doesn't officially exist. I searched all over the Internet looking for this model, with no success. Even the insurance company couldn't find this model. We are almost certain that it was built as a FEMA trailer, following Hurricane Ike in 2008. The original owner told us that there were several identical trailers on the lot that weren't finished. This one didn't have a table in it yet. The dealer said that they were told to "just sell them." We have since talked to someone else that had the same tt, bought at the same dealer, in 2008. Everything on our trailers was identical. He said his wasn't complete when he told them he wanted it, but they did finish it before the sale.
Hurricanes Katrina and Rita were both in 2005, and were both very bad hurricanes. Perhaps your 2005 was also a FEMA trailer built following those storms, but not used for that purpose.
I've inquired with FR but never got a response.
Regardless, we love our FEMA trailer. And given that the original owner purchased it cheaper, he passed on the savings to us when we bought it from him. So, we got a great deal.