285's is generally the biggest you can go. You will need to trim some off the lower air dam though because they will rub when you turn.
Cranking the t-bars allows you to run 285's with no rubbing. You can crank all you want, just get an alignment done soon afterwards.
305's WILL RUB for sure and I wouldnt run those without a lift.
285's look good. 295's can be put on there as well but they'll rub unless you've trimmed and cranked.