This is my work at the moment so more I know easier it is to sell and also design new products.
That accuracy for the truck is more than enough what you have at the moment. Just make it little bit longer or then use the safety distance what you get if you multiply the trucks current length by 4. It close enough to three second rule. at the moment it looks like its about 16 meters long? Also at the front there is only one front axle at the front between those two you have at the moment, but even that should not effect the big picture.
The catch here is that you should be able to get nice results by first doing three simulations and after that make a simulation about "truck train" and you should be able to compare results easily to wind speed. and also cd when you have the data from huchos book.
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