I wouldn't know whether to scream or cry if I was part of the original restoration crew.
According
to this old manual (granted, for a UH-1B) the clearance from ground to the front tip of a tied down MR Blade is 18' 9.54". Mast height is 12' 8.5". The overpass clearance says 15.0'. Give at least two feet of height to the lorry bed and this load was trouble on wheels.
Where was the oversize load escort?