I don't think Detroit has released it for the Titan yet...I contacted them about a week ago and they said 'sometime this year'
Some people like them beacause they work (are on) all the time, and others hate them for just the same reason. You will get a bit more tire wear out of a fixed rear setup. I'm sure others will pipe in with more.
From past experience, I like the Detroits...They make bombing down desert roads go a bit easier (not to mention the lower liklihood of getting stuck). Traction devices on a 2wd truck do wonders.