I have installed a dual master cylinder and rerun all the brak lines. I would be using the factory drum setup though. I want discs on the truck, but the 3/4 ton (8 lug) conversions dont appear to be readily available.
The trailer is equiped with electric brakes. I know that is not the end-all solution but it should help.
With regard to attaching the hitch reciever, the previous owner has welded metal like a tank to the frame and created a whole new rear bumper configuration. I was intending to utilize that setup and attach my #3 receiver unit to it.