whitewalls were a result of the fact that early rubber "naturally" came out white, and carbon black was added to the tread for better traction, ALL early tires were 'whitewalled'
they were common in the early days, then not so popular .... they were available on 30's cars and it's possible someone might have put whitewall tires on a 37 truck, but I'd doubt the factory offered them, and they certainly weren't standard
Porta-walls are still available if you have bias tires, they don't work well on radials
Bill
