Trældal is from Narvik and served in the city council as leader of the opposition in that town until his election to parliament. In 2006, Trældal was sued by the against leaders in Narvik Energi for alleged slanderous statements about economic misconduct in the energy company. Although he was convicted in the trial court, the Court of appeal ruled in Trældal's favor, and the Supreme Court turned down the energy company's appeal.
The Progress Party nominated Trældal as their third candidate from Nordland in the 2009 election. During the election Trældal campaigned on improving the municipality finances, building the Hålogaland Bridge without toll stations, and permitting oil activity in Lofoten and Vesterålen.
Trældal won the county's leveling seat, and is one of three members of parliament from Narvik. In parliament, Trældal became the Progress Party's spokesman for agricultural issues, and supported a freer market in meat production.
- Aase, Anne; Johnsen, Geir (2006-02-07). "Dømt for ærekrenkelser" (in Norwegian). NRK Nordland. Retrieved 2009-10-28.
- Larsen, Per Willy (2007-03-26). "Må betale en million" (in Norwegian). NRK Nordland. Retrieved 2009-10-28.
- Lyngmoe, Helge (2009-06-29). "Bekymret for kommuneøkonomien" (in Norwegian). NRK Nordland. Retrieved 2009-10-28.
- Lysvold, Susanne (2009-09-15). "Tre Narvik-væringer på Stortinget" (in Norwegian). NRK Nordland. Retrieved 2009-10-28.
- Eltvik, Anders (2009-10-20). "– En stor dag for landbruket" (in Norwegian). Nationen. Retrieved 2009-10-28.