I believe a lot of people are missing the point here... if a manufacturer is not willing to number a vehicle (#1 of 500 for example) then it's not technically a limited production run vehicle.
Toyota explicitly states "OVER" not "Limited To" in its marketing because they knew if they attached a number to production people would misread it and feel like they were getting something special and also it provides them the flexibility to produce more than the number... so if the public wants more than 3,000 for example, you can order it and they will build it and take your money.
My guess is there's quite a lot more in circulation each year than 3,000 in the US, probably more like 10,000 or 15,000. I have no evidence to support this number other than the language of the previous post and the fact that Toyota obviously saw the sales and marketing genius of attaching the "TRD" logo to a model, which is why we now have a "TRD Offroad" model 4Runner for 2017.
If you think the TRD Pro model is the most limited produced 4Runner ever, you're only kidding yourself. This doesn't mean no one should buy it... heck, I may buy one, but I'll know what I'm buying when I do and not going to let some salesman feed me a line of BS about a vehicle I know more about than he does from every aspect.