1. As mentioned it depends on weight you want to distribute. The beauty of the adjustment jacks is you can adjust it so very easily, according to load that day, or even a gas stop just to tune it a little using a tape ruler at the wheels wells.
2. It's 3/4". Use the provided wrench, your stabilizer speed handle, or a drill. Or a combination. I use drill or stabilizer wrench to take up the slack until tight, and the wrench to snug it in.
3. Possibly. I just eyeball it. The really important thing is to align the stinger straight into the box (don't even attempt a an angle to the head box), get real close and set the height with tongue jack so the stinger is a maybe an 1/8" high, set the box at the saker tilt as the stinger with one or the other jack adjustment, and back in.
4. Maybe, never needed it.
5. Read the thread referenced by Isbrodsky. Again, hitching is about alignment. Unhitching is easy if you measure and write down your unhitched truck front wheel well height, and use the tongue jack to match that measurement again before trying to drive out of the hitch.
You'll develop you own procedures with use.
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts