I have utilized two Blue Ox tow bars, Rangefinder II and currently Aventa II, no problems and have been very happy with both. No experience with their newer LX model. I have the SMI Air Force One, also no problems and am very happy. While both SMI & M&G provide proportional braking and are good units, I think the main advantage SMI has over M&G is that if you upgrade your toad to a different model, the SMI will probably transfer where as the M&G unit on the master cylinder will probably not. Like you, I did not want to tap into the existing lights on the toad utilizing diodes as had heard of possible problems doing that. Luckily I had room in my toad's tail light lenses to install an additional blub (not LED) utilizing a special short socket purchased from Blue Ox. You might want to get a second opinion or investigate yourself to see if there is room to do that on a 2012 Jeep Wrangler.
