Returned to the antique toy store and found a Tootsie Toy Winnebago and a Jada Bronco. The Bronco is about 1:56 and the Winnebago is about 1:53, but I would rather have them a little small than large - they can be set back from the edge of the layout to enhance the perception of distance.
I can still make headway on my layout when I’m out of town!