No, the shocks will give you enough vertical lift for the 285's but you might need wheel spacers so the tires don't rub because they are larger. You might be ok without, but most put 1.25 to 1.5 inch wheel spacers to make sure they can turn their steering wheel alll the way without the tires...
Yes, but you might rub a little on either the UCA or pinch weld at full turn. I put 1.25 inch spacers on and eliminated the rub. Looks a lot better than stock and fill the wheel wells nicely.