Well, I am still trying to solve the stasjonsvogn question #15 but I believe I can answer this one.
This should be a 1938 Dodge with folding sunroof and motor installed in the rear. The Dodge came from Olrud Auto.
The body work was done by Brumunddal Mek. Verkstad to the order of Rutebileier Johan Andersen of Jevnaker.
Apparently, the bus was destroyed in April 1940 during the German invasion.
Unfortunately, I do not have a model number for the Dodge chassis and I have no details of how the motor setup was installed in the rear which was not something Dodge offered as far as I know.
Bill