Re: 2014 Grand Cherokee Overland 4x4 NEW TIRES
My Jeep has the same tire. There's no functional advantage to a larger tire, but there are disadvantages, as you noted. Go with the same size. I've been very satisfied with Nokian Rotiiva AT all-terrain, all-weather tires.
2014 Jeep Grand Cherokee Overland 3.6L 4x4; Quadra-Lift II; ORA II; Advanced Technology Group. Built April 2013. At 41,000 miles transmission valve body assembly under warranty. At 43,000 miles (70 000 km) transmission replaced under warranty. Now has 53,000 miles (84 000 km).