He debuted in 1955, racing at Las Vegas. Starting 12th in the field of twenty-seven, Ruppert used his skills at his hometown track to secure a career-best 6th place effort despite being nine laps down.
He returned for his final two races in 1956, starting the year off at Lancaster. Starting a career-best 9th in the race, Ruppert had another solid outing and ended up 13th by day's end. His final race wouldn't turn out to be better, as a mid-race crash left Ruppert 24th at Phoenix.