[Gary Atsma]

So are most Class 8 conversions a Class C or are they Class A's?

-By definition, most Class 8 conversions are Class C motorhomes.

Where do the Class 8 conversions fall in regards to their classification as a Class "A", "C"...?

-See above.

Motorhome size has nothing to do with classification?

-No. Configuration determines classification

Is this classification clear or are there gray areas?

-Well, either a chassis starts with a cab or it does not. Anything gray about that?

What Class A motorhomes would start as a Chassis with no cab?

-All of them. They start as a bare chassis with a temporary seat, steering column, control pedals, and maybe a dashboard, but NO cab structure

Are there advantages/disadvantages of having one over the other?

-Depends on whether you want a truck cab around you, or the same structure as most motorhomes(This ought to be a no-brainer)