Will it fit?
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Wheel width and backspacing are as important to fitment as the tire size and lift height. A 285/70-18 is an odd size, and is basically a 34x11.50 tire. I think that or a 33 inch tire like a 285/65-18 (33x11.50) or a 305/60-18 (33x12.50) would be a good choice with a 9 inch wide wheel with 5 or 5.5 inches of backspacing. And yes, your friends Readylift kit will fit