mdourish:
Find various low bridges until you fit under one then you have your height.Sent from my SM-G950F using Tapatalk
Hoping and assuming your joking here mate. 
Some take stuff seriously on here. 
Could see height sticks being useful for skips and containers, but dont know too many trailers without their height marked. Coop were a little odd as they gave height of trailer above wheels (box bit) then had to addon 5th wheel height from unit.
Just watch the midlift on some units as lifting those wheels can alter the height the whole lot runs at (Scanias apparently and definitely DAFs). Oddly it jacks the whole lot up.
Oh and addon quite a few inches for good measure. But DDs should have it marked just the same.
Yes, pop one in your lidl bag and watch the faces in the office light up as you limp in for your keys
Beanbonce:
not a driving god like you.
Well that’s…
Damned kind of you to say so, thank you.
Work for Swains. The guy that trained me said in his broken English “we don’t bother with that” (or strapping loads, even double stacked cat food.
And, he was as good as his word, we never changed the height indicator once.