Do you just get kicked while driving normaly or do you do something specific?
I get kicked sometimes when I open the map, I avoid this by opening the map after I'm in the game but before i hit drive.
There are also a few other diffrent things you could do.
-Close unnecessary programs you dont need while playing TruckersMP
-If you have a SSD you could try to install your game on the SSD instead to increase the performance
-Dont go to populated areas, I think it would be enough to avoid Calais-Duisburg
I hope I could help you. Maybe you should try to contact the support?