Firefighters had to cut Rolleston - who was coherent but suffering "horrendous injuries" - from the wreckage before he was airlifted to Tauranga Hospital.
He's now in the intensive care unit in a stable condition at Waikato Hospital. Maxwell is recovering at home.
Picking up the phone at 11pm to hear the news was "horrific and every parent's nightmare", said his father Craig Maxwell.
The boys were childhood friends who enjoyed playing rugby and just hanging out together.
Craig Maxwell said he was relieved Kaleb had been discharged from hospital, but he was still in a lot of pain and had to wear a back brace.
Identified as an up-and-coming talent for the Bay of Plenty under-19 team, Maxwell can play wing, centre, fullback and first five-eighths.
Head coach Cory Sweeney was glowing about his potential.
"He has an X-factor about him, the ability to break a game open and he's got a skill set that matches."
Maxwell faces months of intensive rehabilitation.
"Kaleb has bruised lungs and his chest has been punctured. He has a sore clavicle, four fractured vertebrae in his back and neck and lacerations in his kidney," Craig Maxwell said.
"It's a terrible situation where both boys have their lives ahead of them and this happens."
Despite his newfound celebrity status, James Rolleston was a humble young man who cherished his whanau and the community where he grew up, Maxwell said.
He was raised in Opotiki by his nana, Christina Rolleston, and is spoken of fondly by his teachers.
"He was talented, popular and extremely humble about his success," said Susan Impey, principal of Opotiki College.
Rolleston became a household name after starring in Taika Waititi's cult hit Boy, as well as roles in The Dead Lands with Te Kohe Tuhaka and The Dark Horse alongside Cliff Curtis.
Tuhaka and Curtis have visited Rolleston in hospital, where his mother Angeline Rolleston and nana Christina have kept a bedside vigil.
Tuhaka, best known for his television roles in Shortland Street and Go Girls, said he was saddened by the accident and in awe of his "little bro".
"He is the most laid-back, breezy Maori boy from the coast. James is unique because he never over-thinks when he is acting - he allows his instinct to kick in."
Tainui Stephens, a producer on The Dead Lands, credits Rolleston's success to his grandmother. "She is a loving grandmother - James knows that. He is a very aware, smart young man - terrific to work with," he said.