tuckin 20s on a stepper

[HardKoreKustoms]

can some one point me in the right direction to find the correct offset I need to get for my rat wheels so the tuck on the rear step. I have no problem cutting the bed side to name it work I'm going to be running mob steel 20x9.5 wheel with around a 10in wide tire in the rear so what offset or how to figure it out. and up front I'm running 18x8 with a8 in tire. wood I still be able to.turn still with a 8 inch wide tire yo front being 3 inches from the ground
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