Is it traction control or stability control? They introduced stability control in 2011 only with the low power D4D but not until 2012 models with the engine that needs it (V6). Mine is a 6th or 7th month 2011 and it still had the 15" wheels where the stability control vehicles got 17's (on the SR5 in any case). My ute definitely could benefit from it on wet roads, if you increase throttle to maintain speed up a hill it can kick back two gears from 5th to 3rd, and that straight away brings the V6 to maximum power. On wet roads this and the LSD can kick the back end out 90deg in no time. It has done it to me a few times, once when I first got it it spun 180deg on me and I was then travelling backwards at about 20kph, luckily I thought to knock it into neutral or it'd have kept spinning.

It is now mandatory, Toyota sold off any SR's cheap that didn't have it very recently.