You need to look at the offset printed on the inside of the wheel. A tire size cannot be recommended without knowing this. I would recommend a 265/35R18 front and a 285/30R18 rear if you have the proper offset. Chances are you do not. You will probably have to run a 255/35R18 front and the 285/30R18 rear. There is no way to say if this will fit without the offsets.
Later, Steve
Later, Steve