285's trimming/CMC

Hey everyone. I'm in the market for some wheels and tires. Just got a Toytec 3 in. Boss lift with light racing UCA's and am wanting to put 285/70/17 on her. Looking at a set of wheels 17x9 with +1 offset. Ive read tons of threads covering this topic, but it goes everywhere from backspacing to offset being the issue. How much trimming and, if any, CMC will I need to be doing? I'm trying to avoid CMC as much as possible. Thanks for the help!

 

i just installed a 3" lift and 285s on 17x9 -12 offset wheels and i had to trim a whole bunch of plastic, all in the wheel well so you cant see it really; but i still need to do a cab mount chop since i rub pretty bad in reverse