A plow on an ML is a REALLY bad idea. The plowing will absolutely destroy the unibody. You would also likely have to alter the front bumper cover, etc. etc. Find yourself and old Ford or Chevy 3/4 ton pick-up with a plow on it. Save the ML for what it was intended, getting groceries. Or you could get a four wheeler with a plow if a driveway is all you need to clear.

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1995 G320
1984 280GE
1971 Unimog 416