I have a 2018 Silverado LT Crew Cab with a 6 foot bed. I want to get new tires/wheels for it because what is on now looks like baby tires. right now it is P555/70R17Looking for some advice. Can I put up to 20-inch wheels and still have decent tires to clear the wheel well without a lift? Does it need spacers? Not looking to go mudding, but would like it to look a little meaner? Thanks