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Maybe it was a depot or pre-surplus sort of mod to replace an older/ obsolete/ NLA air manifold with off the shelf truck parts. In ops pic it doesn't look like it or the lines are secured much, maybe they just wanted to get some more trucks moving? Maybe some A3 guys can chime in if their truck...

I'm not familiar with the A3's, but that looks like a later addition, modification or repair, since push lock fittings were not around when these trucks were built. If you follow a few lines, it should give us a good idea. Could it be for a home brew axle vent or fording kit, distributing air...