[QURyan XTRyan;23862762]You can definitely go with a small leveling kit like the Mammoth Leveling Kit
to give you a little life without changing much else. It'll let you fit up to 35" tires on the road if you wanted to. You will want to check what gearing you have to decide how big of a tire to go with. Let me know what questions you have or if you'd like a quote on anything!
Get an inexpensive leveling kit, doesn't matter what brand really.
if all you want are 33s, you should be totally fine.
As Ryan mentioned, if you decide to go with 35" tires, you might want to look into regearing because you'll start to feel sluggish on the highway. But if you don't have a problem with that, then you'll be just fine with 35s, the gears aren't "required"