As Jacob said, there are obviously differences in how sprayers are worked there compared to hear.    I spray slower then many, and I normally run about 13 mph with my row crop machine and 19 mph with the flotation machine.   We had a Knight boom originally, and it was not suitable to our use.

What size is your Challenger?   Have they always been sold in yellow in France, or were they originally in Claas colors?  

Is that a US pickup I see in the one picture?   Are they common there?