They did make a Ranger that was rated for somewhere in 1 ton range. At least on paper. They made RVs with a dually rear end. If I remember correctly, the axle bearings didn’t have a long life.
As far as the current Ranger and it’s size. It was never intended for the North American market. It was intended for the rest of the world that typically do not buy F150 or larger class trucks for private use. Hell, even their semi trucks are small compared to ours. Of course, their countries aren’t the size of ours either, which the exception of say Australia or Brazil coming close in size as the continental U.S.
In any case, most places in Europe were built and designed with vehicles in mind outside of horse carts and carriages. Anything larger is a tight squeeze and the driver skills are down right impressive.