you can go 285/65/18s no problems at all, I had 285's on my ford and couldn't tell a difference from 275's. If you go too big you'll lose pulling power, acceleration, and fuel mileage.
the BFG 285/65/18's are good tires but about 300+ a pop
I have goodyear duratrac's now and so far they not bad, but a little louder than the BFGs
may take a look at 295/70/18 nitto terra grappler, mixed reviews on these but they should fit and be about max size
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