I believe they allow RVs to sold as the year sold or up to three years newer then what they are?
I know I would negotiate by the chassis year that's the part that maters if if has the v10 I believe they fixed the sparkplug problem by 06 or at lest improved it? Others that have the v 10 will know more then me. I went with a diesel engine. On the trucks you have to pull the cab to fix !
Gary