rv4us3,
I've ran the Ready Brake for years on our Jeeps too. It's great system. Now, I cannot answer your question accurately due to the fact that I'm not familiar with the bumpers on the Libertys. But, off the top of my head, it cannot be all that hard. It's a bumper. So, simply drill it, and install the cable housing end. Now, if it's a plastic cap, over a steel bumper underneath, then you'll have to accommodate the "space" in between the steel one and the plastic one. Not that hard. One more thing, I don't know how you set up your last R/B but, the instructions say to "clamp" that cable system to your brake arm in the Jeep, or whatever your toad is.
That sucks. I drilled the brake arm on the Jeep and, set the end of the cable up with a small clip and, when not being towed, the cable is wrapped up in a coil, under the mat. When it comes time for towing, reach under the mat and hook the cable to the brake arm and then proceed to the front for continued hook up. Way cleaner and, that cable is not being "Actuated" each and every time you press the brake while driving the toad on a daily basis.
And, the hideous way in which they want you to "adjust" the link cable to the actuator is pure bone head. I simply setup the link cable with a stainless steel turn buckle that is infinitely adjustable and seriously easier. Just and idea or two for you to think about. Good luck.
Scott
Scott and Karla SDFD RETIRED2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 GMC Sierra 1500 Ext Cab 4x4 Toad
2008 Caliente Red LVL II GL 1800 Goldwing KI60ND