first time posting here in the tire forums, this is for my dad's 1996 LS400. He's been runnin on his stock rims/tires since he got it in dec 95... yea he doesn't put much miles on it. anyways, he's lookin at rims roughly 18x8.5 size and want to know what offset will he need to have it fit so that everything tucks right under the fender. He's on stock shocks/springs and sometimes carries a heavy load in the back so it'll get low in the back. To clarify more, since i'm sorta new to this whole tire mod portion, he wants the tires to fit under the fender and not rub if he hits a dip or carries a heavy load in the rear. He wants the tires to stick as far as possible without rubbing basically. i hope this is clear enough. also what is your opinions on "katana" and "centerline" rims?