Definitely flat tow for us. I don't want the hassle of fiddling with a dolly. We have had two toads, a 2010 Wrangler Unlimited (meaning a 4 door) and 2012 Wrangler Unlimited. I moved the base plate from the 2010 to the 2012 myself, not a difficult task.
I have backed up a couple of times when I got into a jam. First couple of years when I was learning to gauge how much space I needed against what I saw out the windshield. I'm better at it now. Unlike Jet pilot Waiter I advise you to be very careful when backing up your rig with a car attached via flat tow. You can get away with a few feet but you can't control the direction of the front wheels in reverse, caster works against you in reverse.
Avoid the dolly, that's my advice. Also be sure your new car can be towed flat, read the owners manual don't trust the salesman. Not all jeeps can be towed flat.
Gary, Cindy, Reacher (Maine Coon), and Vivian (in spirit only now).
Retired: July 31st, 2013 and loving it.
2011 Coachmen Encounter 37 TZ pulling a 2012 Wrangler Unlimited Sahara. Many upgrades, additions, mods, and changes.