Grigg,
I've corresponded with the guy in Texas about his swap. He put Dodge rotors on the stock hubs and made his own caliper brackets.
1-ton disk brakes He also put a Cummins Diesel in it also.
My P30 is wearing 16-inch wheels and I'm happy with those.
I think the 1-1/2 ton is just going to be parts and could contribute a front axle to this project.
I'm building a dually pickup using the rear of the panel to make a pickup bed. The P30 rear is part of the plan, and the disks off the front of it could be part of this project too.
My 1/2-ton Suburban has 5-lug disks on a straight axle. I used a kit for that conversion but figure I'm on my own for this one.