That is a “Trucker’s Hitch” and definitely not a “Dolly Knot” as used by most GB drivers.
That knot appears to need an end passed through the half hitch loop.
In a Dolly you do not pass any ends through. So Dollies can be tied at any point in a long skein of rope, without pulling yards of rope through.
Spot on there Fr, and well spotted.
A few more from years gone by , note the cowboy roping between bales , as if that sheet would be enough to hold the load 
Amazing how those bales stay on… with no rope on them, only on the sheet. Almost like magic.
It looks brand new and very smart
It’s one of those unexplained mysteries, how can a canvas or plastic sheet (FFS) secure a load by only roping the gaps between the load … let me think now
To answer that you’ll need a ‘font of all knowledge’ in road transport operations. Somebody like errr let me think. Howzabout CF. Say know more. 
HawhawGuffaw
Ray
I will have you know that CF invented computers and writes every encyclopaedia in the world.
I’d quite like to perform a little experiment on CF to demonstrate the surface tension generated by a tight sheet upon an object…… Ideally I’d place a carrier bag over his head and secure it at the neck with a cable tie, I’d then stand behind him and pull the bag really tightly onto his face. After a minute or two I imagine that he’d grasp the intricacies of the experiment l
Could always put it on You Tube.
Load bearing canvass sheets who needs load bearing reinforced curtains.
Bonus points anyone knows why the head of the dolly should be angled upwards ?.
I’ve just knocked up this one using the hoover power cable slung over the door.
I was wearing these when I did it
Construction and use regs were the same regs then that they are now.Anyone with any sense knows that a piece of canvas ain’t going to stop a paper reel or 1t or 500kgs pallet flying off the back of a flat.That’s what ropes, straps, chains etc etc are for.
Unlike Bewick while wearing rigger gloves to save taking them off to tie every knot and putting them back on.
Bewick just used his bare hands to rope he must have skin like a cow’s.
No they aren’t you are talking crap and are totally wrong
Most normal people roped and sheeted with bare hands the ones that have never done it ie you would need gloves but soon realise why no one else used them
Why is there a naked lady looking through the window?
