Hello, I have a 2014 4x4 GMC Sierra 1500 SLT Short Box. It has 55k miles and the original tires of 275x55xR20. It is stock, no lifts, levels, or anything. I need tires. I wouldn't mind stepping up a size or two, but don't want to have to level or lift. What can I get away with that would looks good? 275x65? 275x60? I may eventually level the truck, but just need tires now. Appreciate any good brands too. I like BFGs AT2, and have had General Grabbers AT2 on other vehicles before. Thank you!