The width of your rims/tires is more about how much room there is from the leaf springs to the fender. Look on line for custom wheel dealers, most have a drawing of how to measure for your wheel.
So using your 9" Ford axle as an example, center it in the wheel opening and measure backspace and front space and if you decide on the Ford you can get your wheels made to your measurements.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed