That takes up the whole bed. Yikes.
Usually on the rollbar, to make room for coolers, sleeping bags, tents, etc in the bed.
My truck doesn't have a rollbar so I have it against the cab, to the side, out of the way as much as possible. 1 ratchet, thought the hole and to the loop in the corner of the bed.
But on my 4runner(also runs 35's)I have a 31"(and thin-10, not 12.5) spare in the stock location. Neither of my axles are welded(LSD), so it still serves as a way to limp off the trail and get another 35.