True. the roads were terrible in the early 1930s. And these wheels were over designed because of the lack of computers which tweak things to give you just enough to pass.
But I can understand the gentleman's concern. They are over 80 years old. Metal changes over 80 years exposure to thermal cycling, rust, wear. Even great steel monuments like the Brooklyn Bridge need to be repaired. When I was a kid, I was ridding in a car with my brother and we when very fast around a turn.. I asked what would happen if a wheel fell off, He said..A wheel would never come off.
A week late we made the same turn and a wheel feel off our car!!. It didn't come loose from the lug nuts but instead, the stayed attached to the car but feel over 90 degrees to lay on its side as we lit up the area with sparks...
My brother was speechless. The car was a 1963 corvair, and this happened in 1967.
I may be chicken...But..I have an all original 1933 fordor and I would never try to push the car beyond 45-50 mph. I feel, If you want a car to operate one of these old cars safely at 70 or even 80 mph you should seriously look into rebuilding a good portion of the power train and suspension. The Fords were pretty good, but I remember the guy who had a 1933 Chevy that used to carry a spare rear axial around with him because that part was know to fracture on may occasions.