offset for 06 chevy colorado

need help with deciding on and offset for my chevy colorado that i wanna bag and body in the future.....iam goin 2 run a dub drone 6 that is  a 20x8.5 wheels with a 225-35 tire...dub is goin to build the wheels to fit my truck and i have no idea of what offset to get considering they r building them to my spec...can some1 plz help me..ne ?s hit me back

YOULL NEED A +45-+50 OFFSET OR 6.5-5.75" BACKSPACING

no matter what wheel you run you will need to shorten the rear end when you bag it and then again when you body it so the first time your shorten it you may want to over compensate lol