I went 285/75-16 on my JKU, but I ended up selling them and if I do it over again I'll go with 15" wheels instead. Tires and wheels are much cheaper, lighter in weight, and more sidewall rides better on the highway and trail both.
~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."