Yeah, that would be worth considering. Thing is tires are already 30". I have a rear 2" wheel spacers on a rear axle. I've tried 2" front axle too, but the tires were rubbing metal while hard turns.
4WD won't run properly, if You have a different tire size between front and rear axles... That's the fact and the biggest problem.
So, no matter what size You got on, they have to be equal and yet fender wells have to provide enough of space for steering. In other words I dubt if that can be done: use the spacers and a high negative ET rims to set the wheels fully outside. I am not sure of that, I'd be glad if somebody tells me I am wrong and there is something that works out

In a current situation, I'd have to cut & trim the body, possibly weld the rear doors permanently to a body.