What about a mechanical clutch LSD in the front, like a Detroit TruTrrac?
I would think that in snow, wouldn't it handle fine around corners b/c you don't have the sudden unloading etc like with an auto-locker?
only key would be to learn not to hit the brakes while IN the corner so that it locks down?
I ran a Truetrac up front and in my experience, the front end would wander. Like it would constantly shift power from one axle to other. It wasn't super dangerous, but was annoying. I'm not sure if all Truetracs or LSDs act this way, but mine did. Still, I would put the Truetrac up front before an autolocker any day.
The other problem I had with my Truetrac is that on super icy roads, where you definately want at least one unlocked axle, it would behave like a fully locked axle. Yet, in the snow, when I wanted it to lock, it never seemed to work. Than again, I wasn't really good at using the brake to make them lock up, like others have done.
The biggest problem with LSDs, IMO, is you just don't know how or when they are going to behave at any given circumstance. With or without a locker, you know the axle will either be open or will be locked and that allows you pick certain lines or tackle certain terrain with confidence or avoid the obsticle, knowing that the truck can't make it.
That said, an LSD is better than an open diff off road and they do have advantages on the street, especially in terms of drivability over an autolocker. You don't get the noise or lurching of an autolocker, for example.