IMO - You should have a supplemental braking system of some sort. For starters, try reading this article about the physics of towed vehicles and make your own decision if you need one or not... Physics of Towed Vehicles
In our modified '97 Jeep Wrangler, I used the Invisibrake and nearly bought another for our '13 Wrangler. Since I was starting with another complete supplemental install, I found a great deal on a US Gear Unified Tow Brake through ebay at about 1/2 the price of the Invisibrake, so I switched.
Once installed, both systems are plug in and go. No messing with a bulky Brake Buddy or similar system that goes inside the vehicle cabin. Additionally, many folks recommend a surge type brake system from ReadyBrake. It has a simple uncomplicated design that operates a cable from the tow bar/receiver to your brake pedal inside the towed vehicle. I personally don't like them as they don't boost the vacuum brakes and rely on brute force to activate the towed vehicle brakes. I feel you should have a break-away brake to go with it, and there are kits that provide that to work with the ReadyBrake.
If you are a DIY guy, the Unified Brake System is pretty easy to install but does take a full day IMO. Pretty much the same for the Invisibrake with the control box that goes under a seat or in the trunk.
Hope this helps!