Re: are we a '92 or a '93?
I didn't see a photo of the data plate(s), but another possibility is the "Incomplete Vehicle" process. A chassis maker (IH, Ford, GM, etc.) often manufacture incomplete vehicles with no body, and the chassis are shipped to the specialty body manufacturer for completion. You see this a lot with ambulances, and I imagine also with Class C RVs and possibly Skoolies.
I believe in this state, the year of the frame trumps any later configuration. If you convert a 1950 Skoolie to an RV, it's still considered a 1950. I've read here in other states that when you get your new title as an RV, it comes through as being new the year of the conversion, such as a 1950 now becoming a 2014.
So it's possible the frame and drivetrain were put together in 1992, and the vehicle was completed in 1993.
Of course, on the other hand that could have nothing to do with it at all. Who knows why every State or Province might think differently on anything or everything?
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.