Chinese factories build firetrucks for $400k in 6wk. US it's $2M in 4 years [video]
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A bushfire tanker is a bit cheaper, an urban pumper costs a bit more. All based on off the shelf^ European or Japanese truck chassis.
The lead time from order to delivery is more like 18 months, but 6 weeks is pretty typical for the actual build time.
^ Not quite “off the shelf” in that commercial trucks tend to be built to order, crew cabs especially, but they’re not entirely bespoke beasts like North American appliances.