It all depends on the rims. My tires are 295s and are 11.6" most 285s have about a .25" smaller width. My rims are the TRD FJ rims with 4.5" backspace and with the 295s they sit about an inch or so inside the Limited/Sport fenders. So lets just say you ran the same wheels as me and got 285s, the Spidertrax 1.25" spacers would put your front tires sitting just about even with the fenders, which I think looks ideal. I'm assuming you have the same fenders as me since you're a limited.
Edit: There are several different type stock rims as well. Just post up a quick pic or just find one on the Internet and I'm sure many of these guys with the same rims can give you the exact answer you're looking for.