Lockie died at the scene. Ms Wallace was taken by the Westpac Waikato air ambulance to Waikato Hospital, but died shortly after arriving.
The truck driver tried unsuccessfully to take evasive action to avoid the crash.
He was uninjured but was receiving counselling.
A friend of Ms Wallace, who did not want to be named, said the tiny Pukemiro community was reeling from the deaths. "It's very sad, put our little township into shock."
Mr Chubb would have a strong support network but he was probably still in shock too, she said.
"I can only imagine that he's not [coping], as you wouldn't, after having one tragedy in your family and then this.
"I think he will be in shock and just wanting to spend time with his little girl and his family."
The friend said Jade's death had rocked the community.
"We're a small township and they had tremendous support when they lost Jade."
The woman said she had had "several cries" already but was thankful that Molly, who was with her father when the accident happened, had not been in the car.
Ms Wallace and Mr Chubb, who is listed on the electoral roll as a baker, were excellent parents, the friend said. "You couldn't ask for better parents."
The Waikato district road policing manager, Inspector Leo Tooman, said the crash was particularly difficult because of the death of a child.
He said six of the police staff who went to the crash site had children under 5 and all would be offered counselling.
"It's not easy. They were thinking, 'This could have been my child'."
He said the deaths took the Waikato road toll to 46 this year, making it a sad Christmas for every family who had lost a loved one.
