Honestly, the base 16" wheels are 0.5" narrower than the Sport S/Rubi/Sahara wheels and the backspacing is a little less. So I personally think that 285/75-16s (33s) would fit on the base wheels better than they would on the upgraded wheels, in terms of rubbing.
In other words, they won't rub as bad as the stock 17s or 18s will with 33s. I would try it and see how it works....you can always get spacers after the fact if that's what you need.
~Lots of modded Jeeps and a Toyota 4Runner~
My favorite quote from the press release.. sad but true: "Chrysler claims its products, especially the Jeeps, can handle all sorts of terrible conditions, churning through muddy swamps, climbing mountains, and crossing rivers. Turns out they cannot even handle a car wash."