The origin of title (manufacture) Vin will always belong to a bus that is Federal not a state regulation,some states issue 2 titles one for the chassis and 1 for the conversion,I have a RV with Idaho plates that has 2 titles
For vehicles being converted from a new shell/chassis, wouldn't the cert of origin list vehicle type as something similar to chassis cab, bare chassis, cutaway van, or chassis cowl, like is done for conversions built on a van or truck chassis? I imagine that Bluebird did something similar when they built the Wanderlodge. Or are you saying that they'll all list what they built as a bus even if it's not yet a bus and will never be one?
Prevost conversion shells are listed as a VIP for RV's but it still has the Prevost serial number as the Feds require the day it was made with letters to tell the style ,all buses were except GM they never built a conversion shell