Cooper is due back for another seven laps of the 35km course at Dovedale's Hancock Forest today.
"We are hoping for a better run, the car has the potential to win it."
Cooper's brother-in-law is his spotter. "He sits in the tower and navigates me, tells me when to turn and reminds me to breathe," Cooper said. "My life is in his hands."
Cooper said the sport was dangerous but no more so than rugby or soccer. "It's not nice when those pine trees jump out at you though - you have to watch those."
Since his PowerBall win Trevor had bought properties for himself, his parents and his sister, and has filled his new garage with street and race cars.
Next weekend, the former trainee check-out operator will race alongside his motor-sport heroes in the Lucas Oil Off-Road Racing Series in California in another new purchase - his coveted American-built buggy, a Geiser Bros No 71 Pro 2.
"For the next few months we will be going back and forth to America for racing. They have so much of it over there, it is really competitive."