do you think that 285/60R16 or 295/50R16 can be fitted without any problems(off-road and on-road using)?

285x60R16 = 29.5" tall by 11.5 wide if I'm not mistaken.   Considering how a 28.75x8.5 tire fits on mine (touches the frame, even with wider than stock backspacing), I would guess that they're gonna rub the frame REAL REAL bad if you don't get some serious wheel spacers.  And then once you space the wheels out far enough to keep them off the frame, you might need to hammer/sawzall a bit in the front fenderwells.

Could probably be done, but not a 'quick and easy' thing to do, I would think.

i'd like to buy a 3' lift kit but what do think about 235/75R16?

if you run a lot of sand go with the wider tire, those aren't tall if the numbers are correct, frame rub is no big deal, you learn when to stop turning.  if not in the sand why not stick with a 10.5 width..