My truck came with mud/snow tires on it, 23x8 on 12" aluminum wheels, but has some interference when turning right, so I took the big wheels off and put the 145R12s back on. The truck had locking lug nuts that are round with grooves in the sides and use an adapter to use either of two different sized lug wrenches. One of the nuts was particularly stubborn and I actually twisted the adapter, so it's now sort of helical. I don't want to go through that again and be left with no way to remove the lug nuts.
I believe your truck has M12x1.25 nuts on it. Check out this thread for a lot of good info.... http://www.minitrucktalk.com/showthread.php?t=4763 Those lug nuts should be available at your local auto parts store.
