Well, technically, this is a pretty small truck. But don't let that stop you from using what you have. It is a game after all, and these are just representations.
I usually just look at width and not height. A grown man should not be able to lay down lengthwise across the seats without their legs sticking out from the passenger door, or their head smashed against the driver door
That said, our Model T touring car is about 1:48ish. It's possible to release 1:48 versions of the GAZ if there was enough demand for it. The tooling costs of releasing in multiple scales usually is more though that the profit margins you can actually make on the model as a whole.
-Brent
Company B