"As soon as I saw them coming down the hill to the ute, I thought, 'Oh my God, I know these guys can lift this.' I just kept saying, 'My husband's under the ute, please, please get him out.'
"They deserve an award for it because they were the only people who stopped and ... if they hadn't stopped and done what they did, John would not have made it."
Mr Williams, the couple's son Toby and their dog were in the ute as the family moved their furniture from the central Queensland gemfields to Oakey, closer to Brisbane.
Ms Williams, who was driving with her niece in a vehicle behind the ute, said the leading vehicle lurched in one direction and it appeared as though her husband had overcorrected the steering. The ute rolled "about six times", tossing Mr Williams from the cabin and coming to a stop on its wheels in a ditch.
"It had pinned John underneath it," Ms Williams said.
"We had no idea [where he was].
"I ... ran back to the ute to make sure John was okay and he wasn't there ... I was just, 'Oh my God, oh my God, where is he?' I was calling for him and ... We just couldn't find them. Then I called for him again and we heard this almighty groan.
"I looked back and [realised] he was under the ute."
Some of the Kiwi builders, who were heading to Roma for work, directed traffic by shining light from their mobile phones off high-visibility clothing, while the others carefully lifted the ute and pulled Mr Williams free. He was flown to hospital.
Last week, Ms Williams took a newspaper clipping about the rescue into the intensive care unit where Mr Williams had just woken from a coma.
"He gave me the thumbs-up," she said. "Those boys, I tell you, they were amazing, absolutely amazing. They lifted that ute, mate. They lifted that ute and they knew they had to get him out."
She said she never got the chance to properly thank them all. "No words can say thank-you enough. Nothing can."