The Mavic EX729 is an incredibly strong rim.  Matched wtih DT Hugi 20x110 / 12x150mm TA hubs, this is a dedicated 26" downhill wheel set.  

Tubeless DH Rim with 23mm inner width

If Thor and Zeus raced dual slalom down the side of Everest, its entirely conceivable that whomever was riding this King Pin wheel set would most likely be the winner.