I don't think, from the photos, I would have used a Hi Lift there. From the last image; is that strop attached to another vehicle? If so you could have used that to assist the recovery onto the road. Otherwise with just the one vehicle I would pulled the 4x4 over to the other side of the road.
Not sure, as others have said, of the stability of using the jack there. But everything differs on the event at hand. I am sure that if I was in that situation I'd have other ideas too.
The trailer looks light enough, but then again, the trucks tyres are covered in that thick mud so you might have had traction issues anyway...
