Mr Chambers said this meant paramedics were able to get to patients more quickly.
Last year, SWASFT said its ambulances covered 22 million miles – the equivalent of about 45 trips to the moon and back.
The team of mechanics at the depot are also a major part of the operation.
“I think the team here are the unsung heroes,” said Gemma Priest, vehicle production manager.
“I think if you see an ambulance going down the street on blue lights, you would never think about the team behind that vehicle,” Ms Priest said.
She added: “You wouldn’t consider what they’ve done to prepare that vehicle ready for our crews to get on, to go out and serve our patients.”