What happened in Road Haulage during the war?

At the start of ww2 my Grandad took his Bedford to Liverpool docks surrendered it for the war effort,then he became sergent major and towards the end of ww2 was training new recruits to shoot ,he saw action in France ,whist my great uncle had a Bedford mobile workshop in North Africa and never saw a bullet ,after the war they both set up in haulage agian and lime spreading and had quite a few lorries and spreaders .