I bought axles already locked, with the front being a Detroit. I wouldn't have built it that way then, but I would now. I like that I can't forget to lock it, and more importantly, that it's not reliant on another component (air compressor, air hose, 12v wiring).
I drive mine on the road - with drive flanges - without an issue. Adding selectable hubs would make it an even bigger non issue for on road use.
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