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2011 GMC Acadia - Knocks

Knocking noise in the front wheel areas. I’ve taken it to the dealer several times, the service mgr has heard it, but the mechanics can’t find problem. I’ve taken iprivate mechanic and they could not find the problem…they aSo heard it. It’s embarrassing to drive a car so beautiful that sounds like an old clunker. I need your help. The car has only about 75,000 miles.

Describe the circumstances when it knocks and when it doesn’t.

As a follow on to @shanonia’s excellent suggestion: does the knocking occur when you are turning? Going over bumps? At a specific speed? Does it always happen under the same circumstances?