With no suspension mods I'd recommend a 285/70R17. If you are planning on leveling or installing a mini lift you can run a 295/70R17 on your stock wheels. Both of these tires are approved for your stock wheels. If you want to run a tire any wider than these I'd recommend upgrading your wheels.
Use the tire size calculator in our signature to convert these sizes to inches if you are interested. You can also put your stock tire size in there to estimate the differences.