That’s awesome 
Rather them than me in the driving seat, but it worked out well.
Should come with the standard warning tho’:
Don’t try this at home!
It is awesome, and somewhat buttock clenching, but I was involved in something similar many years ago in Australia.
It wasn’t as nerve wracking as that though because it only involved the 3rd of 3 trailers of a road train.
The Boss, who had a double drive tractor, hooked his train to the distressed one, and George, who I was travelling with on my get the feeling of it first trip, hooked his double drive body + 3 train to the chassis of the tipped trailer and headed out at an angle into the bush. There was no risk to the driver of the stricken truck as in this case, but it was a bit of a nail biter to me as a spectator.
This is how they unload in Taiwan. No need for gloves, elbow grease, blood sweat and tears.
Unloading bamboo