The locker doesn't significantly increase curb weight. If it decreased capacity we'd see a lower GVWR.
The "Weights and Capacities" specifications on the Toyota website only shows curb weight and GVWR. The number on the tire inflation sticker makes no sense, unless it is a reflection of a specific economy-level tire. Payload should be the difference between curb weight and GVWR, which is a difference of 1550, not 835. My wife's RAV-4 has a payload of 1240. 835 is four adults and a tank of gas - a smaller payload than a 2-door Wrangler.
None of the previous discussions provide a solid answer. Until reasonably explained, I will use 6300 as the max weight of a stock 4Runner.