P265/75R16 - Stock non Adventure Package size = 32" x 10.5" - Lots of tires available in this size.
LT285/75R16 - Stock Adventure Package size = 33" x 11.5" - Lots of tires available in this size.
LT255/85R16 - Optional Size = 33" x 10.5" - Same height as the stock Adventure Package tire but narrow like the stock non Adventure Adventure tire. Being narrow this makes it a great choice for areas that get a lot of snow (On road style driving, not deep off road snow). Very few tires available in this size (Cooper S/T, BFGoodrich KM2, Maxxis Bighorn, Toyo M/T, and just a couple others)
LT305/70R16 - Optional Size = 33" x 12.5" - Same height as the stock Adventure Package tire but an inch wider (Same width as a 315/75R16). Great choice for mild and serious offroaders alike. Lots of tires available in this size.
LT295/75R16 - Optional Size = 33.5" x 11.5" - Little taller then the stock Adventure Package tire but the retains the same width. Very few tires available in this size (BFGoodrich T/A KO, General AT2, Toyo A/T, Nitto Terra, Interco SS-M16, and just a couple others)
LT315/75R16 - Optional Size = 35" x 12.5" - Two inches taller and an inch wider then the stock Adventure Package tire. Lots of tires available in this size.