I think it will fit too...but I bet it's going to be real close. My wheels are 18x9 +18 with 275/70/18s and I had to do A LOT of trimming. They fit now with zero rubbing ever, but I can't go any wider in wheel, any lower in offset, or any bigger in tire. I'm maxed out in every dimension. Your tires are quite a bit smaller so that will give you more room, but offset seems to have the most dramatic effect on clearance on these trucks simply because of where the tight spots are.
I had to do a lot of work on the front and rear outer corners of the front fenderwells in order for mine to not rub. That's where your tight spots are going to be so look at your clearance now and do some math to figure out where your new wheel/tire combo is going to sit in relation to your current. That's how I figured it out, and then did the trimming beforehand so I wouldn't get a call from the dealer after they had mounted and balanced all four tires.