After graduating from college, Trueman returned to New Zealand and joined the
New Zealand Breakers for the
2009–10 NBL season. He then played for the
Taranaki Mountainairs during the
2010 New Zealand NBL season. For the
2010–11 NBL season, Trueman joined the
Perth Wildcats. After playing for the
Manawatu Jets during the
2011 New Zealand NBL season, he returned to the Wildcats for the
2011–12 NBL season. Another stint with the Jets followed in
2012, with Trueman then playing another season with the Wildcats in
2012–13. He re-joined the Jets in
2013 for a third season. For the
2013–14 NBL season, Trueman returned to the New Zealand Breakers, but his season was cut short when he was released in late October. In January 2014, he re-joined the Wildcats as a short-term injury replacement for
Matthew Knight. Trueman re-joined the Manawatu Jets for the
2014 New Zealand NBL season, and then moved to the United States for the 2014–15 season, where he played for the
San Diego Surf of the
American Basketball Association. He returned to Manawatu for one final season in
2015, where he was crowned the
rebounding champion. ==National team career==