1. My gut says "no", I think the hiboy/lowboy frames are different. Someone on the list should be able to verify.

2. No 3/4 ton short beds.

3. That is up to opinion. The highboys had factory divorced t-cases, power assist steering, and a narrower frame, but the highboys are taller.

4. you are correct that 2wd power-steering won't work on a 4x4, since most 2wds are rear steer, and the 4wds are front steer, the pitman arm turns opposite directions.