Thanks guys... Quick reply from my phone..
Brushes... Would definitely need to see if something is available that could resist the pressure... May be as simple as increasing from a hair of thin nylon brush.. To something more rigid... To be investigated...
Air gap... I am looking at using vortex generators to skips the gap... For far reduced pricing compared to modifying every trailer...
We can't change the cab without significant changes and testing for safety... So the windscreen will remain static unfortunately
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