I don't think my offset is quite right because I had to add wheel spacers to get my rims to clear my rotors. Makes the front end a bit wider which I'm fine with. I am running 315 75 16's and my rims are 16x8 with 6-5.5 bolt pattern and +10mm offset, the rims are aluminum which makes them a bit thicker. My wheel spacers bolt onto the hub and then the rim bolts onto that so they are just like what's on a dualie, just not quite as thick. Looking back, I think I would find a local shop and try some rim and tire combos to see what fits.
Joel
norcal