I tow a highly modified TJ rather than a JKU, but I'll offer my experience behind our Sunseeker 2300. We use a Blue Ox tow bar, and a Roadmaster Invisibrake supplemental brake system. To get the RVs receiver to match up with the Jeeps bumper requires a 10" up/down adaptor.
I really like the Invisibrake. Once installed, there is little to do other than hook up the tow bar, safety cables, brake-away cable, and electric connection. There is nothing to attach inside the towed vehicle which is a plus if you tow often. Info here
Telescoping arms on your tow bar will make hookup much easier. If you choose to go with an inexpensive A-frame type tow bar, you will find hitching up is very difficult if you have to do it by yourself.
Here is an article I hope you will read about why I think supplemental brake systems are important... The Physics of Towed Vehicles