Tire vs wheel width

Hello,
I had another thread about lifting my 2012 limited, I've decided not to lift right now. I do want to switch out to larger tires with 18" wheels. I was originally going to go with Baja Boss in 275/70R18. I found Fittipaldi FT100SB Wheels | Satin Black | 18x9 18mm | 5x150 that I like a lot. In looking for low cost rims I discovered that this size tire cannot exceed a max wheel width of 8.5". There are very limited options for wheels for our rigs and most owners are using this size tire with 9" wide rims. How bad is the risk of breaking a bead? I'm assuming you cant really air down either. I was thinking of going with a 285/65R18 to be safe with the 9" wheel but its about an inch wider. The problem is the offset. The wheel is +18 and if I'm understanding offsets, that should be fine for the 275 (no rubbing) but what about the 285?
Any help would be appreciated. oh and pics, cant forget the pics Thank you

 

I ran 275/70/18 tires on my 18x9 +18 Method rims for about 3 years with no issues ....no rubbing. Not sure where that 8.5" came from. I ran these on my stock suspension as well with no issues.
I have a lift now and went up to 295/70/18's and get a little rubbing on turns.......just need to trim my fender liner but it's really nothing crazy.
Go to tiresize.com and use the wheel offset calculator. You can put in your stock tires size and rim size in with offset then compare it to what you want to go up to and see the difference. It will show you how much taller the new tire is, how much it sticks out and how much it sticks out on the inside depending on your offset. Stock offset is +60.