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I think that answer is confusing, unless I've always misunderstood rim sizes. I always thought they were nominal diameter by thickness.
As for steering, I'm not sure. I've only ever driven super singles with air-assisted steering.
Those 20x8.5 wheels are MLVW wheels. I think they'll be too narrow for 395s or 365s. The M35A3 uses wider wheels, 20x11.
I agree with going with the modern 395s. Make sure you get an assurance with the date codes on them though so you can better expect when they'll start dry cracking...