Well, I am pleased to say it wasn't anything wrong with the build structure.
It was very simple actually, the stainless trim that covers the corner on the passengers
outside front of the box was vibrating against the wall at speeds in excess of 40 mph faster equals louder (no pun intended ;-).
The guys at Haulmark opened up the interior bulkhead and went for a ride.
Listening closely they discovered even though the noise is emitting from the bulkhead its not originating in the bulkhead.
Sitting in the pass. seat, rolled down the window and could hear it even more, looked in the pass. mirror and could actually see it moving.
A piece of cardboard wedged in and wala no more noise.
Once the unit is in warmer weather I will apply some 3m double sided tape ( roll provided by Haulmark) and solve the issue on both sides.
BTW, from the first time I called Haulmark the calls were returned promptly and the service was professional.
Once I got to the shop I was treated with respect.
The guys in the shop putting things together were happy to be there.
The shop is clean and well kept.
Top notch operation.
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