Hy loadmaster235, the mounting of duals in the rear basically only requires two things, studs which are long enough to allow two wheels to be mounted, and the wheels with the correct offset so they can mount and not interfere with each other or any chassis component. The front wheels are a different story, they require a special hub which moves the mounting flange away from the brake drum to allow a single dual style wheel to be mounted and maintain a front track width as close as possible to original, hope that helps.
