You do seem like the type to test the limits of whatever tires your FJ Cruiser is equipped with. Does Toyota actually offer BFG AT's with anything on their current lineup? The concept's tires may look beefy, but if Toyota doesn't have a history of offering them with their production models, they may not want to do so with the new TJ Cruiser even wit TRD trim.
I know on the first generation Tacomas they all came with the Goodyear Rugged Trails, and may have been the same for the 4Runners from the same time frame. Not sure what the tire offering was for the second gen Tacomas that were non TRD, may have been a Goodyear as well. Toyota is known for putting Goodyear tires on their truck and SUV lineups as a base tire, and not sure if that carried into the sport models. I do know however that they mounted BFG AT's on all second gen Tacomas with the TRD Off-road package and some of the fourth gen 4Runners in specific packages. The first and second gen Tundras with the TRD off-road packages got the BFG AT's as far as I know, may be wrong about the Tundras but I do remember seeing a few on the dealerships lots with the AT's mounted.
The special edition FJ's got the BFG's including all of the trail team. The first two years were TRD's and my memory has drawn a blank if they came with the BFG but I think they did. As far as a base tire I'm not sure if they were a Goodyear product or not.
I'm not seeing an offering for the AT's on the new Tacomas just Goodyear, so it looks like they may have gone back the that brand.
2014 FJ TTUE, Fox 2.5 DSC shocks front and rear, Stainless Steel Extended Brake Lines Front and Rear, Allpro UCA's, Allpro front bumper & 9.5 Warn winch with synthetic cable and factor 55 link, Metal-Tech Red Eye rear bumper, Stock Sliders, Warrior rack, Safari Snorkel and TRD intake, Bushwacker Pocket Style Flares, M-Pac Springtail barrier- rear door, saddle bags and side storage, ICON Shift Knobs. BFG 315/75 KO2's on fuel wheels with 1.25" Spacers.