Needs 17s minimum. There have been a couple of people with 16s, but they had to grind their brake calipers down. Oh, and 18s minimum for the '08 Titans ... bigger brakes.
The MTZ for this size, 33X12.50R17LT 114Q D, [about 32.8"x12" wide on a 8.5" wide rim]. They are 63 lbs., have a 2,600 load capacity when inflated to 50 psi., best with an 8.5" wide rim as that's their minimum approved width.
The MTZ in this size, only has a 2-ply sidewall, so I'd probably stick to their approved minimum rim width. If it was a 3-ply, a slightly smaller rim width isn't as likely to cause tire sidewall flex.
Consider the 3-ply sidewall, BFG MT KM2 in the T305/65R17/E 121/118Q, (32.8"x12" on an 8.5" width rim), with a 3195 lb.s capacity at 65 psi. This tire is a 67 pounder.
Probably a
better match, since you're not leveled, would be the BFG MT KM2 285/70QR17 121/118Q D [33"x11.5" on an 8.5" width rim, and 11.1" wide on a 7.5" width rim], ... approved for as narrow as the stock Off Road, and XE 17x7.5" width rims. This 60 pounder, has a 3195 lbs. capacity at 65 psi.
Link to Tire Rack's overview and pics of the KM2
Rim Backspacing and offset, (diameter of wheel doesn't matter for backspacing calculations).
- A 7.5" stock rim the backspacing is 5.375" with +30mm offset. [Best range +25mm to +38mm]
- For an 8" width rim target 5.5" backspacing, +25mm offset. [Best range +18mm to +30mm]
- And for an 8.5" width rim target 5.5" backspacing, +18mm offset. [Best range +12mm to +25mm]