I just got a set of these wheels for My 2012 5.0....advice would be greatly appreciated as far as tire sizes that would work on this set up. I'm going staggered 19x9 up front and 19x10 in the back.
305 will be a bit too wide IMO on a 10" rim unless you're doing a DR. I currently use a 295/35R19 in the rear but 285/35R19 is probably the optimal size for a 10" rim. I'd be curious to see if a 285/40R19 would give a little better traction with the taller sidewall. The 285/35 is a 27" tire and the 285/40 is a 28" tire, which also fills the wheel well better IMO.
This is my current setup with the 295/35r19's out back and 265/40r19's up front but 10" rims all around.