You will find more on trailers now as truck & bus speedometers are more accurate now. When I started driving buses it was a novelty to have a working speedo let alone one that was correct
. For trailers it will be the only way of measuring the mileage that they do unless specifically coupled to one prime mover only (like an owner / driver unit), but when used by multiple prime movers in quick hitch situations (drop an empty trailer to be loaded & p/u a loaded trailer & GO
) mechanics can better monitor services of trailers
'GM 2strokes, still the most efficient engine ever developed for converting fuel into noise'.
Food has replaced sex in my life now I can't even get into my own pants