Tucker Knight made his first televised main roster appearance at the Greatest Royal Rumble event in Jeddah, Saudi Arabia, entering the Royal Rumble match at #24 and eliminating Drew Gulak before being eliminated by Big E. On the December 17 episode of "Raw", Heavy Machinery were advertised as two of six NXT wrestlers to be moved to the main roster. With the shortened names of Otis and Tucker, they debuted on the January 14 episode of "Raw" interrupting an interview between Alexa Bliss and Paul Heyman. On the April 16 episode of "SmackDown", the team was moved to the SmackDown brand during the 2019 WWE Superstar Shake-up. At WrestleMania 35, Otis and Tucker competed in the sixth annual André the Giant Memorial Battle Royal, but failed to win. In May, they started a feud with SmackDown Tag Team Champions Daniel Bryan and Erick Rowan. The duo participated at the 51-Man Battle Royal at the 2019 Super ShowDown, but they were both eliminated during the match. After weeks of mind games from the champions, Heavy Machinery faced Bryan and Rowan at Stomping Grounds in a losing effort. On the July 2nd episode of "SmackDown", Otis and Tucker defeated Dolph Ziggler and Kevin Owens to become the number one contenders to the SmackDown Tag Team Championship. At Extreme Rules, Heavy Machinery lost to Bryan and Rowan and The New Day.