A note about your "special" BFG M/T. Your BFG M/T tire was likely from a 2007-2008 Jeep Wrangler Rubicon. The cool thing about this particular size is that it is SPECIALLY-designed by BFG for Jeep Wrangler Rubicon. When the Wrangler Rubicon came out in '07 (as a new design), Jeep wanted a M/T tire that is also good all-season (aka in snow & ice). Therefore, Jeep ask BFG to redesign the BFG tread to be a better all-arounder (better on-road, slightly quieter, and better in bad weather). Thus, these Jeep M/Ts have more biting surfaces and slightly closer lug spacing. If you go to a tire store and look up other sizes of BFG M/T, then you will see a few differences:
1. Other sizes have less biting notches on the center lugs
2. Other sizes have lugs more spaced out, both the center and edge lugs
There is no way to get this particular "Jeep design" in any other sizes than 255/75/17. You have to get this size to get this particular tread design. Otherwise, you have the same toughness as in other BFG M/Ts, including 3-ply sidewall and thick tread.
So, what you have is probably the best BFG MT that you can get as an all-arounder mud-terrain. It is quieter and better on-road (bad or good weather) than other BFG MT. It may not be as good off-road as the new BFG M/T KM2, but it should be better on-road and quieter.
Good buy...and as long as it fits, drive it in good health...you got a great tire there! (Yes, i am a bit envious!)

So, to answer Falls, you went with this size because it's a special tire!
P.S.: And i would not put more than 35 psi in your tires...in fact, i would try what Toyota recommends for stock tires.