I've contacted numerous dealership around my aread in California, but can't seem to find a 06 Rav4 either in the sport or limited that has the tow prep option, which comes with a bigger alternator, radiator, and the tow wiring. Has anyone added this after they purchased a Rav4 and if so, how much did it run? Does it also increase the max. tow capacity listed by toyota as well??