Tires

Tires for commercial vehicles (working trucks)typically have steel casings and steel belts. Tires for consumer vehicles (usually just used for personal tranportation) typically have a fabric casings and steel belts. Why? People who maintain working trucks find that it is worth the extra initial expense for steel/steel tires because they are more durable, are less likely to create a downtime situation and, when worn out, are very likely to be retreadable. I would call your situation more like a working truck than a "consumer truck".

Overall, I think the bias tire's footprint shape is affected more by inflation pressure than the radial tire. This is due to the belts under the tread of the radial that create a flat tread surface in an overinflated or underinflated situtation. So, given the same underinflated condition or overinflated condition, the radial tire's wear would be fairly uniform across the tread. The bias tire would tend to "crown out" if overinflated and "dip in the center" if underinflated leading to center wear in the first case and shoulder wear in the second.