As a child he gained weight rapidly and by the age of seven months he weighed 2 stone (28 pounds 13 kg). By the age of four he weighed 12 stone (170 pounds 76 kg) and was taken to be examined by the eminent doctor, Sir Frederick Treves.
When he started school at six he had a 44-inch (1,100 mm) chest and 46-inch (1,200 mm) waist.
Shortly after this he began to tour England under the management of entrepreneurs such as Fred Karno. Trunley appeared on the music halls informing the audience "I want to be a jockey".
After the First World War he negotiated a film contract playing small character parts. He is buried in Camberwell New Cemetery.