He also won breeder of the year, his broodmare Scuse Me won her division and Roberts is the principal of Woodlands Stud, which stands stallion of the year Bettors Delight.
He also bred and owns 2-year-old pacing filly of the year Dream About Me and bred 3-year-old pacing winner Have Faith In Me.
While those feats would usually guarantee the owner of the year award, Roberts was pipped for that honour by Trevor Casey, who owned or part-owned the winners of 92 races Australasian-wide, headlined by Stent, who won aged trotter and trotter of the year.
The main shock was Chase The Dream downing stablemate Lazarus for 2-year-old male pacer, after the latter won the Harness Jewels.
The Orange Agent, Speeding Spur, High Gait, Conon Bridge were other one-sided winners, while Sunny Ruby's Jewels success earned her 3-year-old trotting filly, with Kincaslough the trotting mare of the year.
Westport racing identity John Reedy won the Outstanding Contribution award.