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I agree with both.Remember with locking hubs its unlocked the ring and pinion don't turn as your driving down the road so every once in a while it is suggested to lock them in to keep it well lubed so rust wont set in on ring and pinion. locked in driving on dry pavement if you have a posi can be pretty rough on the front end.
Transfer case engages and front driveline and diff are spinning. Hubs engage or disengage axles from wheel to ring pinion/diff. I have manuals on my 06 Dodge. I turn em for few miles when not in use and use 4 wheel drive to keep em good. I do leave my hubs locked when I will be in out of 4wheel or weather might be bad on a drive. Doesn't hurt anything to do that. But they are manual for reason, to unlock and prevent wear. So ya do what ya want but keep em out most times. Also 2 wheel low is cool for backing up trlrs.