Thanks for the feedback on the tru-tracks Erin. I expected they would perform great. I think the tru-tracks are a good option to a selectable locker.
You will also find that they respond very well to preloading, which is done by slowly depressing the brake pedal when the tires start to slip. That (helps to) equalizes the preload on the gears. I have been able to make these diffs behave almost like a locker with that technique.