For me the best way to answer the question about the rear locker was identifying the intended use of it....to probe further into difficult terrain or to get past / out of difficult terrain? For me and the big, honkin' camper I bought, the ARB locker in the rear will be about making it past a really muddy section, through a particularly high snow drift or getting out of a place it's no longer prudent to go. It won't be about a man, his machine and their terrain-conquering capabilities. I'm holding out on buying a winch in favor of finding a nice camping spot and then simply taking a walk where it looks like a winch would be required.
Alright, this is just fancy car camping, people. Move along, move along.