yeah I believe that is true, but it will be major trimming since that size is a true 33" diameter tire. You will probably have to trim the front bumper and the pinch weld by quite a bit. If you aren't afraid of a sawzall I would be interested in seeing the outcome with the new tires. I know this has been done on similar year Tacoma's but I haven't seen a stock 4runner with 255 tires on it.
I wouldn't consider anything wider than a 255 without a lift though