1.42 has just been released for Euro Truck Simulator 2 and American Truck Simulator.
TruckersMP is currently NOT compatible with these updates. In order to play TruckersMP, you will need to downgrade your game to the temporary_1_41 branch.
Check out this article for more information on how to downgrade your game.
Interested in having a say on the future design of the Scout car? Well check out the following survey to let your ideas be known!
You can find the survey here.