To start 285s will rub the stock fenders front and rear if you flex but will be ok on-road only. As already mentioned you will only gain 1" in overall tire size which= 1/2" ground clearance. No point going 1/2 way go with a lift and 35s or stay stock height with 265s on new wheels for the look so you keep your mileage.
2008 Black and Khaki Sahara Unlimited. Auto, Tow pkg, Dual Tops, MyGig, Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 35x12.50x17 Pitbull Rockers on Blackrock Viper Alloys, Flex-o-lite trans cooler, Mr Grille billet grille inserts, AEV Prem Bumper ETC.. AND a Locked and Lifted Honda Foreman for when the trails get real tight