Yes, it comes up all the time but there is no definitive answer! Guys just say "i used such and such and it worked" but rarely give the suspension mods, tyre size, body modifications or disclosed if and how much it rubs.

Most guys seem to go for +10 so they are flush with the body side with rolled guards, or even +0 so they stick out a little bit. But to fit the widest tire under the guards use a +30 you can get 185s under the front and 205s under the rear ute. With non-stock wider front suspension (i.e. A10/Stanza), perhaps a +20 will work best.

To be sure, take your existing wheels off and measure the distances from the brake hub face to the inner and outer fenders. Allow some room for clearance and now you have your max width tire. The offset of the hub face from center will match the wheel offset.

Are you going to use stretched tires (narrow tires on wide rims)? If so the guidelines are a bit different.