A Jeep Wrangler can not be towed on a dolly. Read the Owners Manual.
Of course, you can remove the rear drive shaft after you get it on the dolly, then you can tow it.
As for brakes on a four down towed, very few if any states require such brakes, although it is a "good idea". The "lists of towing laws" that one can find on the internet usually quote TRAILER brake laws. In many states a towed motor vehicle does NOT meet the legal definition of a TRAILER!
However, most states (and the FMVSS, Federal Motor Vehicle Safety Standards) do have braking performance laws. You must be able to stop in a certain distance (usually 40 or 45 feet for a "combination of vehicles") from a certain speed (usually 20 MPH) on a level, clean, dry, hard surface. If your rig can do that, you meet the requirements of the law.
If I were to buy an auxiliary braking system for a towed motor vehicle, it would be the Ready Brute Elite towbar/braking system from NSA. I would not buy any electronic gadgetry, ever!
Many people have towed many different vehicles for thousands of miles without auxiliary braking, with perfect safety.
the choice is yours.
Good luck.