Questions w 285 70 17

Hey all I'm new here. I just bought 285-70-17. I have a 2010 taco Trd sport. Putting a 3" f and 2" r lift. I want to get rockstar 17x9 with offset of -12 and back spacing 4.5 , how much trimming will I need to do and if anyone else has a similar set up please share pics. Also don't know if I would be better off w a +10 offset. Thanks for all the help!

 

Well I don't have the exact setup...3" lift with XD addict 16s and 4.53 bs and -12 offset. Put 285/75/16 duratracs on and it rubbed a bit on the fender where the front mudflap would be, rubbed a lot more on the front bumper and splash guard. Trimming still wasn't too bad. It will be a lot of trimming if you plan on hitting the trails pretty hard though. I can post pics tomorrow. Not sure if the positive offset would be better or not.