Super-Duper Stuck Brake Caliper Bolts on 2000 Toyota Tundra??

I am in the process of replacing the brake rotors and pads on my 2000 toyota tundra and for some reason the bolts holding the brake caliper to the knuckle do not want to come out. I pre-soaked the bolts with kroil the day before and then again and heated it up with a propane torch and then hit them with a big wired 1/2" impact wrench (albeit with a 3/8" adaptor on it) and still no dice. Any advice on what to do next? I really would like to avoid replacing the steering knuckle if possible and so I dont want to snap the bolts off or anything like that. There is rust present (rust-belt truck) but not crazy amounts or anything like that on the caliper bolts.