Sarah Damen, 37, was walking on the pavement in Bere Regis in Dorset on Friday when the crash happened.
Mrs Damen, a mother of three young children aged five, four and two, died at the scene.
Another woman, Suzanne Gee, and her daughter, Rebekah, three, are recovering from their injuries. The driver was arrested and bailed.
The 44-year-old man, from Wareham, had been arrested in suspicion of causing death by dangerous driving.
A red Land Rover had been travelling along the C6 Southbrook road to Wool in the village when its trailer detached, ploughing into the group.
Mrs Damen's children and her 44-year-old husband, Mark, have been comforted by relatives.