I have spent 2007 thru 2011 spreading the news about the Phoenix Cruiser on www.rv.net
and I think I did good getting the word out. Since, I let more recent owners carry that torch for the most part. But I do back them up with historical reliability & customer service.
Like you say Carol, Phoenix Cruisers seem to have fallen into the "B" national database, though it is surely a "C" constructed vehicle.
Building a class B, motor home manufactures start with this.
Builing a class B+ or C, they start with this, most often a van-based, but sometimes pickup-truck based.
They are delivered to the RV companies without a rear wall, seats, or outside mirrors.
The rear wall gets a thick plastic shrink wrapping to provide temporary protection for the interior.
I wish there was the right pic that showed the delivered RV chassis.
Here is the chassis setup for a cargo truck, but it has mirrors and seats.
The RV chassis has a disposable cafeteria seat that gets tossed. It is used for lot-driving only.
Going further, the class-A gets built on one of these.
Engine up front (most often gasoline powered)
Engine in back (diesel pusher used for larger & high end class-As)
And Super-Cs start with these types when people want a big "C" with a diesel engine.
Of coarse the Sprinter is the choice diesel for the little fellows.