His finishing was of the highest quality and won him the man- of-the-match award from the Dewsbury Legends side, who had earlier drawn a curtain-raiser against a team of Great Britain All Stars.
Pick of the tries was his last, a length-of-the-field effort started by outstanding prop Anthony England.
England took the ball from a Toulouse restart and smashed his way through the defence to send Wainwright on a 45-yard sprint to the posts.
Dewsbury scored five tries in all and were dominant throughout, leading 12-0 at half-time.
Austin Buchanan grabbed their first in the 24th minute and the rest of the early points came from five goals by scrum-half Dominic Brambani.
Brambani ran the show and tormented the French full-back with a series of stunning ‘bombs’. Then, in the 44th minute, he whipped out a try-scoring pass for Wainwright to scorch over unopposed.
In the 58th minute, Brambani then finished off a fine break by prop Kyle Bibb to go over for the Rams’ third try, converting to push them 24-0 in front.
Toulouse got a consolation try in the 67th minute but Wainwright added his second and third as Dewsbury coasted home.
Dewsbruy coach Warren Jowitt said: “This was one of the best performances since I’ve been coach at Dewsbury and was a great response after the off-day at Batley last week.
“It was a quality performance that showed we can compete in the Championship.
“We came out all guns blazing and I felt Brambani was outstanding.”
Dewsbury Rams: Glynn, Wainwright, Cosgrove, Turner, Buchanan, Brambani, Wandless, England, Blake, Bibb, Spicer, Lockwood, Tonks. Substitutes (all used): Menzies, Walker, Horton, Bolger.
Toulouse: Albert, Payan, Planas, Coutourier, Olari, Nicholls, Villegas, Worth, Cook, Faure, Wynn, Laroyer, Houles. Substitutes (all used): Corcoran, Pelo, Tisseyre, Anselme.
Referee: R Lawton.