Just rear tires! Would never go that wide on the fronts.A 305/35 profile won't push the tire further outward than a 305/30 but it has a larger diameter so will fill more of the "wheel gap." It's the 42 offset that potentially could cause a little poke. A 305/30 should be fine since the diameter is pretty much stock and you're not lowered. I don't have enough experience to know about the 305/35. I see a lot of pics here that look like they might rub but they apparently don't.
You are talking about just the rear, right? If a square setup you will likely need spacers to clear the front suspension on the inside. The widest most go without spacers is 285 with about 35 offset.
No poke at all on the rears. Here are better pics showing the front and rear tires relative to the fenders. Although the fronts do poke out a little, the sidewall slope matches up perfectly with the fender so the tread does not extend past the fender.
