Looking to purchase a 6" lift for my 08 king ranch. I have my sights set on the rough country 6" lift. My question is, what's the difference between the 4 link kit and custom ordering traction bars? Or do I need both. Also, any other kit that would be better? For $1400 a full 6" lift and 4 link seems great. I will also be using this to tow anywhere from 8000lbs to 20,000 lbs and will be using air bags. Thanks for the replies in advance!