Pulling a 2 tonne car along the road takes nowhere near 2T and using the towball would be fine.
Use a 2T rated endless sling (like this: https://www.ebay.co.uk/itm/375040310433 )
Hook your towball to his towball and gently tighten the sling...
If you do decide to tow someone out of the mud, make it very clear to them ( video it on your phone ) that any damage to their vehicle is their responsibility.
You could possibly pull something off their vehicle.
Hi Matey ...
I hope not as that's £19.61 + vat and p&p ....
Now then, hang on - that could be where i've been going wrong, looking for a set screw not a stud ...
50p from Blanchards - more my sort of price :p