The Snowspeeder and Cloud Car toys are actually slightly larger than the movie scale, because if you look at the actual models you'll see that the pilots really are too big. Sure someone could fit in the Snowspeeder like that; but only if he had no legs.
I think the only vehicles that are truly to scale with the movies are the Speeder Bike and Power FX X-Wing. A-wing and Landspeeder are pretty close but are a little too stubby.
The worst scaled vehicles are the Falcon, Queens Starship and the AT-AT. With the AT-AT being the most distorted and misshapen of them all.