green48,
There are pics out there of a '47 to '54 red crew cab dually. Not sure where I found them, but I have a few.
The builder simply widened the bed so that the stock fenders cover the outside wheels while tubbing the inner wheels. It looks close to stock from a distance. He only had to widen the tailgate, a lot simpler than doing 2 fenders.
PM me and I can send the pics to you.
I'm putting dual wheels under my '59 3800, I plan on widening my rear fenders to cover the outside wheels.
Lane