If you can find a mid-late 70's 3/4 ton D44, you can swap the brake caliper bracket directly onto an F150 knuckle. Actually you can swap any of it, the bolt pattern for the 3/4 ton spindle is exactly the same.
The issue you will run into is that since the 3/4 ton rotor is much larger, you won't be able to use your 1/2 ton rotor. This is solved by using your 1/2 ton spindle and a late model Dodge front brake rotor. A buddy of mine did this exact setup on a Jeep. There was some minor machine work that had to be done to the rotor I believe, but otherwise it is a bitchin setup and you gain dual piston calipers with the 3/4 ton stuff.
One other thing of note is that you CANNOT put 1/2 ton brakes on a 3/4 ton knuckle without doing major reconstructive surgery to the knuckle. The caliper won't even come close to fitting. Just FYI, I had a set of flat top knuckles from a 3/4 ton D44 that I considered using but it's way too much work for a modified knuckle that is potentially dangerous.
I know plenty of people running mil tires on standard 16.5 rims and have had no issue at around 20 psi with no beadlocks or screws.
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I know a few people too, the problem is that military tires are very stiff and the rubber compound is very hard. Really bad choice for offroad tires. Better to go with a different tire if you REALLY want 16.5's, OR just do it once and do it RIGHT and get 17" wheels.