how wide are the wheels? you aren't going to want to run an oem size tire on a 10" wide rim..
if they are the oem width, then i'd just use the stock size tires from the newer trucks that have 17" wheels.. i think my mom's boyfriend's '06 has 265/70/17 tires on it as the oem size, which are the same overall diameter as your stock 265/75/16 tires.