We had the Class C version on and E-350 chassis, same curved walls same rear end with the spare wheel housing and the offset window. Ours was by a US manufacturer, whose name I can't remember, but it was one of the majors.
The vehicle was only made for one model year before they sold the design to Ultrastar. The interior layout was a disaster and the Ford 460, with a carburetor and enough smog equipment for a small city, only got 6 mpg at sea level and less than 5 at altitude.
We bought it to see of we would like the RV lifestyle, which we did, but the vehicle itself was a nightmare. The exhaust manifolds were warped and leaking , because an earlier owner had put gaskets between the manifolds and the head. $1800 later, they didn't leak any longer.
It turned out that the interior layout didn't work for us. The main bed was a standard twin with a big piece cut off at 45 degrees on one corner. It was surrounded by walls everywhere except that corner. DW and I couldn't both sleep there.
Also, the pedestal tables that went in front of the sofa were on steel tubes that went into unlined holes in the plywood floors. They rocked enough to spill drinks! We sold the turkey on consignment after less than 2 seasons, taking a 50% loss on our original purchase price.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.