Why? This sounds like a nice upgrade:

The truck comes equipped with air suspension, allowing its height to be adjusted to four different levels. It’s all-wheel drive, unlike its predecessors, and being electric, there is more space for storage.

And the article says it has a fallback diesel engine if the battery runs low:

According to the city, it also has an onboard diesel engine that will automatically engage when the battery drops below 20 per cent during an extended firefighting response, ensuring no breaks in service.