I just wanted to throw out that the 2006-2008 4wd suspension is nothing at all like the 02-05 4wd suspension. The 02-05 used torsion bars. All of the potential rub points are different.
I put -12 mm offset 17x9s on mine recently. It works out to 4.53" backspacing. The backspacing is the important number. Too high and you'll rub on the inside (sway bar most likely). Too low and you'll wear out your hubs and possibly scrape fender liner. Factory 20s are 5.75" backspacing (+19 mm offset). I had 1.5" spacers on before. The spacers worked fine, but they were temporary due to the safety concerns. No scraping on the fender liner at the equivalent of 4.25” backspacing (5.75” – 1.5” = 4.25”). Never had one loosen up on me, but I only had them on for about 2 months of daily driving.
I stuck 35s on my 17s and it looks great. The smaller diameter rim (bigger rubber tire) has also given me a more comfortable ride with the cranked t-bars. I have a 3" body lift on mine though, so no guarantee on fitment. I've heard that 4wds with cranked t-bars will clear 35s, but you'd want to do some research on that one before dropping $1k+ on rubber. The body lift doesn’t add anything to the suspension components or frame height. I don’t believe the fenders themselves are an issue. The body lift does make it look a lot better though.