Help me plan out my wheel+tire sizes. Do I need a full-size spare too?

I've got a stock 2020 TRD OR DCLB that I'm planning on giving a ~2" lift with the Old Man Emu medium load kit.

Wheels
Once the lift is done, I'm looking at a set of 16"x8" Fifteen52 Turbomac HD Classics. It looks like I can choose a back spacing of 4.5" or 4.75".

Tires
For tires, I'm considering BFG KO2's or Falken Wildpeaks.
I know this question has been done to death, but I've seen discussions that these various sizes can fit without any rubbing:

• 275/75/R16 (32.2")
• 275/70/R16 (31.2")
• 265/75/R16 (31.6")

265/75/16 seemed to be the safest bet, although I'd prefer the extra height (.6") of the 275/75/R16 if that would work.


Questions

1. What backspacing should I choose between 4.5" or 4.75"? How will that affect rubbing and tire size?
2. Knowing the backspacing of the wheels, what tire size should I go with? I'd consider myself a weekend warrior, driving mostly easy forest service roads, but definitely have spots where I have to do some rock crawling. If this is too difficult to guess at over the internet, should I bring the wheels to Discount Tire and have them match and test in person?
3. I'm used to AWD cars where all the wheels need their treads matched and a full-size spare is required. Should I get a fifth wheel and tire, or is the stock wheel under the truck sufficient?

 

I've got a 2" lift (Bilstein 5100's) on 265/75/16 Duratracs, OEM rims. No spacers, no rubbing. (.06 is not even noticeable), but going wider is were your gonna need spacers, etc....

I luve, luv, luv my tires, but am definitely going pizza cutter 255's next time around.

Good luck

 

I've been running 265/75/16s with the oem wheels for a bit and had no issues. Eventually lifted & got a set of Fifteen52 Turbomac HD classic in 16x8+0. I believe w/o spacers they would've been fine. Although I added spidertraxx 1.25'' spacers to clear my rear shocks when articulating so the front ended up rubbing at full lock or under compression etc. Cab mount chop fixed the issue though!