I think I've only seen one guy on here that has a 2010 Ranger.
If I'm not mistaken I believe most traction control systems simply apply brake pressure to a wheel that is detected as spinning to send the power to the opposite wheel. Which in theory I would imagine works just as well as a limited slip, if not better, so long as you're looking for bad terrain traction and not trying to drag race. Perhaps AllanD or somebody can supply a slightly more technical explanation.
Your best bet is probably going to be checking edmunds or something like that for reviews. It seems like most people here, like myself, have an appreciation for things that are older and better built than new stuff.