It's gonna be close either way just in different places. The -12 offset may rub the inside of the fender well and the -24 will rub the outside where the fender liner meets the fender. I'm running 20x10 -24 with 305/50r20's they barely rub the very outside of the fender liner at full lock when I turn, but my truck is a low as it will go with the keys I have in it. I can do some work to the fender behind the liner and make them not run but just haven't had time. This is on a dmax but you will get an idea of how far they stick out. I personally like the -24 offset because they will have a little bit wider lip.
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