Outer Limits 4x4 Board

Hey all,
I'm looking around for a set of alloy rims for my wagon and am unsure as to what offset.
I wanted to go with a 16x10 rim to fit my 305/70/16's on but am worried they will hang to far out the guards and I dont want to get pinned by the fun police as it is a daily driver.
I think I will go with a 16x8 in a wider offset. Does anyone have this combo and can steer me in the right direction???????????

The best I can think off is a -22mm in allmost any brand rim in a 16 x 8.

Gooday, yeh, i agree, i am using Coopers with 265x75x16 with the 25 offset {the best i can read} and i have 20 mm cover from trim to face of tyre
Gazza