I'm not sure, but I do know it uses the frame mounts along the bottom. I would assume the rubi rails use the same mounts so it would most likely replace them.
I also live in the Houston burbs and have a Sport S w/3.73. I've had 35" Atturo Trail Blade XT on 17X9.5 American Racing wheels(for weight comparison) for 2 weeks. I installed a 3.5" rough country spacer lift to fit the tires.
Oddly, I didn't have to do anything for my speedometer?? It may be...