Victorian Pastors Nathaniel and Cheryl David died in the crash near Exton on July 10 last year while on holiday in Tasmania to celebrate their 20th wedding anniversary.

Their three teenage children - the eldest of which was 18 - were in the backseats.

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A coronial investigation into their deaths has revealed the family's vehicle was travelling on the wrong side of Bass Highway.

Police body cam footage and eyewitness accounts helped Coroner Simon Cooper confirm this was the cause of the crash.

"At least two of the David children later told investigators that they also realised the vehicle was in the wrong lane. One shouted a warning to his father immediately prior to the crash," Mr Cooper said.

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The Davids' station wagon collided with a car travelling in the opposite direction driven by Demi Jones, who had her partner and four-week-old daughter also in the vehicle.

According to Mr Cooper's report, Mr and Mrs David likely died instantly and their children suffered severe injuries including leg, spine and rib fractures.

Ms Jones' partner also sustained a spinal fracture, though she sustained only minor injuries.

Amazingly, her four-week-old daughter - who was secured in the backseat - was uninjured.

Mr Cooper was unable to ascertain exactly why Mr David was driving on the wrong side of the road, stating the most likely cause was inattention.

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Following the crash, the Davids' children were taken to the Launceston General Hospital for treatment and a GoFundMe page was set up by real estate agency Ray White Berwick to raise $40,000 to support the teenagers.

The page remains open to donations and to-date has raised just shy of $42,000.

Mr and Mrs David were considered pillars of the Victorian Filipino community in their roles at the Loch Alive Christian Church at Loch Sport, Gippsland.

The coroner's report made no recommendations.

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