Leaving long distance jobs aside (the sole reason why I miss Long Distance 2 - 500km deliveries took approximately 30 minutes to complete, exactly the time I could spare on daily basis), forcing you to play more than 60 minutes non-stop, even highest wage/km jobs could lead you into hellhole with few or no jobs (ahem, Magdeburg).
For normal in game cargo (Which goes max up to 25Tonnes I think), any truck will do. Without a doubt fully upgraded or unupgraded Volvo FH16 Globetrotter XXL, 3 wheel extended chassis. The Scania S High Roof costs whopping €308,130. The most expensive truck available in the truck dealership.
The only way to disable the double trailers is to give up the scandinavia map, it comes with that DLC, you can turn it off by right clicking the game and click on downloadable content and uncheck the box on scandinavia
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