Given your needs and winter weather daily driving, I would opt for a selectable over a mechanical locker, that way it acts like an open diff when not engaged.
A selectable does take a little more to install and run, but a cheap compressor and tank can be set-up if you don't want to pay for an ARB compressor, cheaply enough that you could carry a spare compressor and still be under the cost of an ARB compressor.
Outside of installer error, I have yet to see an air line fail or get ripped out while wheeling.
I should have said in the original post that the snow has been heavy the past couple years but really is not super snowy for more than a month or two at most. 2 years ago I believe it was record breaking since 1979! I do like the idea of being able to turn it on and off with the flip of a switch with a selectable. The reason I have considered a truetrac is because of the ease of installment and maintenance it requires over a selectable locker. The truetrac really is making me want to choose it with its price and what it offers. About half the price of lets say a ZIP locker not including the compressor. If someone could explain to me the difference between 27 pinion and 30 splines and which applies to the locker/LSD I would appreciate it. And maybe some info on what I would need to do if I would want to install a truetrac on a stock rig. Do I need to replace my axles? My diff gears?
