Odd, as a lorry driver needs to look out of that window for manoeuvring and looking into the nearside mirror - I guess it was a case of no reversing in the rain!Nice pic.
Note: the windscreen is in two halves (split screen) therefore you only needed one screenwiper.
I can remember my accelerator cable snapping when I was in the Stourport area in my Morris Minor rot-box. It was Sunday and no garages were open in those days. So I bought a ball of string from a paper shop, tied one end to the lever on the carburettor, exited the bonnet and ran the string through the quarter-light window. All I had to do was pull the string with one hand and steer with the other. Oh, no hands when changing gear! Got me home OK and I have this little story to tell which I have not recounted since that very week.Many road vehicles, in past times, including cars, were pretty basic. No extras - no all singing and dancing, except those in the luxury price bracket. It was what the working man could afford. They were more easily repaired, often by amateurs.