Fortunately for Mr Bishop, his partner and two children, aged four-and-a-half and 18 months, all of them were travelling in the separate double cab in the front of the vehicle.
The family were on their way home after spending a weekend in Wanganui in their campervan.
They had bought the Mazda flat-deck truck about six months ago and covered in the rear deck with beds and a small kitchen.
The vehicle had a value of about $16,000 and was insured.
"We've only been away in the van a couple of times. We had planned a longer holiday, and that was to happen in about three weeks' time," Mr Bishop said.
But he was thankful the family was safe.
"That's one of the reasons we bought a double-cab, because we didn't want the kids riding in the back," he said.
They managed to save most of their possessions, including a newly acquired cat.
"He befriended us from the time we arrived at the camp ground, and the holiday park owner said we could take him.
"He was getting a hard time at the camp, so we borrowed a cage from the SPCA to bring him with us."