I wish I were experienced but my 2-ton has never had working brakes...
Maybe I'll fix that soon, but its behind several other priorities.
In my youth I drove similar sized Ford trucks for a farmer. I remember hauling 12,000 pound loads and feeling confident it would always stop even though it only had drum brakes.
If you are not going to make it go faster than stock, and not going to over load it, I think a good working drum brake system with a hydravac should be more than adequate. If the truck is otherwise stock keeping the original brakes should be fine.
