Lorry = commercial trucks, semis, tractor trailers, right? As for your question...
To be politically correct, no way! That's a terrible thing to say!
To be statistically accurate.... yes, absolutely.
Being isolated reinforces and/or trains those traits (see also: classical conditioning), and also those types are more likely to choose a job like this where their personality traits or behaviors will not cause problems or make them feel bad. I know someone who is a trucker specifically for these reasons. He's a great guy and really fun in general. ![Smile :)](./images/smilies/icon_smile.gif)