"We're only half way through, it's a mixed bag, not very clear cut," said Auret.
Hosted by the South Waikato 4x4 Club, the Okoroire course was unique in the national trials as drivers navigate their way through native bush courses, rather than open farmland.
Auret said while he and rival Biggs prefer "big ball hazards", such as the near-vertical muddy hill climbs, the change of scenery made for a fun day.
"It was quite neat to do something different.
"More tight, technical hazards, but still enough in them to test the bigger trucks.
"Mechanically, the truck was brilliant all day.
"We were third at lunchtime, we had a good morning but made one mistake before lunch that cost us.
"We held our [top 3] position, the points are tight between the top ten people."
In the Class C competition, Whanganui's defending champion Kevin Hermansen had a good day - coming third in his division and ninth overall with 515.08 penalty points behind Lower Hutt's Daniel Howat (419.72) and Wellington's Phil Conwell (475.2), the 2016 Class C series runnerup.
Whanganui's Grant Harrison did not have a great day in Class C, with 882.6 points seeing him finish ninth in class and 31st overall, while John McGonigle blew his engine out in Class D.
The next round is in Mangaroa, near Upper Hutt, on February 12.