Hey
@Black. Think about a body lift in addition to your suspension lift. With a +12 offset and 33" x 10.8" tires, The outer edge of your tires will be pushed out over an inch as
@gixer2000 indicated. Your 275/70R18 are the exact same outer dimensions as my 275/60R20 (33" x 10.8"). At a +18 offset, my tires "stick out" about 6mm (1/4") less than yours will with that wheel. At stock height, I rub pretty badly when 'wheeling, and have torn out part of my right rear fender trim. I've had to cut all 4 fender trims at the top with a razor blade, which helps give the tires a bit more room, but they still rub at full stuff. Any more trimming will require cutting metal, so I stopped there until I can find a not-too-rough looking fender solution.
Remember that suspension lifts (whether by spring or spacer) only change the resting position of your wheels in the
same suspension arc (vs stock) relative to the body. So while you'll have
more travel before you touch body parts, you will still likely rub body parts at full stuff when off-roading or driving over dips at a fun-but-faster-than-normal pace. This is why I'm a fan of body lifts. They don't look great, but they're super-functional in this respect. An inch of body lift can give you much better tire clearance than a couple inches of suspension lift. I plan on a 1" to 1.5" body lift in addition to a very mild suspension lift (1-2" like you), and I'll armor up (rock sliders, skid plates).
Now, the big question is- how do we install a body lift when nobody makes a kit? Washers & bolts... then gotta think about how to extend the steering column, and which wires and hoses will start to pull. Probably a full weekend project which I don't currently have time for.
BTW, on tires - I decided on Nitto LT-duty E-rated tires (Exo Grappler) because my main priorities are to NOT bust a tire when wheeling with the family, and tow-steadiness - hence the large 20" wheels (less than ideal for 'off-roading) + E-load range. Nitto tends to overbuild their tires. With the 20x9 Methods I got, this combo is 103 lbs per corner vs. the stock 77 lbs. Yikes! Acceleration and MPG both suffer a bit. I've also run Dick Cepek Extreme Country (E load range) on my 4Runner. Those are amazing tires, awesome off-road traction, air down nicely, but not as stiff or durable as the Nittos and a bit noisier due to the larger tread voids.
Good luck with your decision. Nice wheels! They look a bit like Volk TE-37's.