One thing to think about in the 16" vs 17" wheel decision: tall radials (85 ratio) are readily available for 16x6" wheels (like the etrailer ones) but not available for 17". So a 16" wheel with a 235/85 R16 radial will be about 31.7" in diameter, whereas on a 17" wheel you'll likely be a 70 ratio and actually have a smaller diameter (30"). You can go bias ply truck tire of course and get back your tall tire, but give up the ride quality.
