Any coach I ever had was based on the House year not the chassis year and they were all registered as such. Chassis is an incomplete vehicle, it doesn't become a MH until the house is built. That's usually a year later but I remember some years when sales were down and production slowed that the chassis were 2 or more years older. Coaches were still titled as the year the house was put on. Even orders for custom coaches take a long time and will have this discrepancy. They are still the year the coach was finished. This method not only makes sense, but is valuable to marketing and getting financing as well as fair market value. Everyone wins. No one wants to buy a brand new MH that's a year old, including the bank. It's the same in just about any industry, heck cars are putting out 2020 models now.