Both Thule (pronounced "Too-Lee") and Yakima racks will work on the ML, and
plenty others too, but those are two names I looked at for my ML430. The
application listings for each of those manufacturers lists virtually every
car and sport utility vehicle made, so it'll be easy to avoid a dealer.
You'll need two components: The (4) base clamps that go onto the ML roof
rails, and the (2) crossbars that fit across the roof into the base clamps.
From there, you can add a rooftop cargo carrier, ski rack, bike rack,
skiboard/wakeboard rack. Basic system would be about $200-$300 for the
base clamps and crossbars.
Both systems are available at REI, but any place that has roof rack systems
will have one that will fit an ML.
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