A friend of mine had 285/65-18 (same overall dimensions as 285/70-17) on his stock 2011 and they are fine. Saturday I saw a 2013 on the dealer lot with 285/70-17, so I guess it is not a problem and they look great.
Thank you guys. Anyway, had a problem with the computer, so I had to decide before your opinion. Got 265/70/17. When they installed the 285, showed me that the tire is touching the stopper bolt, so I chose the 265 (only 6 ply) insted, I hope is okay. Cheers!