Towing 4-wheels down.....braking required for vehicle?

Have the Blue Ox base plate with the NSA Ready Brute and surge brake system on a 17 2 door Rubicon. To answer the electrical question, we use the magnetic stop-tail lights from e-trailer that eliminated all wiring to the Jeep. It can eat batteries (6-AAA batteries each) but no wiring! I have a small cargo rack over the spare tire that I also velcro strap these lights to ensure they stay put. Love them-