Great insight. I blew the sidewall out while on i215, and started thinking of future plans for the 4Runner. 20 years ago I had an 1984 Toyota X-Cab. I ran a 35" bfg on a 15x10 rim. I needed 7" of lift to clear them which would be way too tall for me now. With this 4Runner, I would like to go with more of an expedition type vehicle.
As I began the tire research, I first started to look at factory Toyota wheels. I wanted the truck to still look as factory as possible. This is when I noticed that there were 16" and 17" rims available. I used the google machine to do some research which was pretty much echoed on this post.
If money was not an object, I would get a nice looking factory Toyota 16" rim/wheel and get a set of bfg 265/75R16 (31.7x10.4R16) . I like the size of approx 32x10 which is a size I can not find in a 15". (The closest I can get is either my current 31x10.50r15 or 33x10.50r15 which would require a lift kit and/or fender trimming). The 32x11.50R15 is available but does require getting a new set of rims. On some forums, a few people claim to have installed them on 15x7 rim with no issues while most have said that tire shops refuse to install on a 15x7 rim because the required rim width is 8-10".
With the expedition type build, I want to do a mild lift, winch, rock sliders, lockers, and possibly a new gear ratio since the third member will already be apart for the lockers. Tires and wheels are the first step