Sorry I haven't combed through the entire thread. Had a MaxJax two post in my old shop because of limited ceiling height. I was in my 40's then so I didn't like positioning the arms, but no problem. Getting out of the doors in a two-door (Cuda) was an acrobatic chore. Those little lifts are fine if you use a rolling seat, we've pulled engines and replaced 4 speeds with no problem.
If you have the resources, I'd suggest a 4 post with rolling hydraulic jacks. I have an Atlas 409 four-post which I think is discontinued, but its extra wide for your dually and extra high with rolling jacks. I can park an Equinox under it and a Ram 2500 crew cab regular bed on it with a 13-foot ceiling height. I also have an old Atlas 408 four post but its just wide and long enough for a car (Charger). On that one I have to take the ramps off to get another car under it. In the shop we have a newer Bendpak extra high and extra wide lift. That one we've NEVER used for cars/trucks because Bendpak offers a diamond plate filler that makes it a huge height-adjustable workbench. Never intended it that way, but you will love it if you work on large heavy items. Has a tendency to collect junk though...
If you have single entry doors, I strongly suggest getting a lift with an inside-the-post clearance that is wider than your doors. That way you can't hit the posts and your mirrors at the door framing become your guide. All things considered get the highest/widest lift you need. However, if you're not going to put more than 9,000 pounds on it, save your money for other shop tools. Besides, like trucks, your buddy has a larger one that he will lend you (occasionally).