Trenkel was a competent racing driver who raced mainly between 1948 and 1963, who only even raced with East and West Germany. During these years, recording a number of good results, including 12 class wins and numerous podiums finishes, with the majority of these at national events. Sadly, Trenkel is best remembered for incident during the 1954 Sachsenring-Rennen Hohenstein-Ernstthal. During the race, Trenkel lost control of his Porsche, hit and killed three race officials. His last International event was
1963 Rallye Wiesbaden where he finished 11th overall. ==Racing record==