In response to discussion in another thread:
Honestly, in the cab of an appliance on the fireground it can be a bit difficult to wear a seatbelt. As an appliance officer you'll have severak radios to reach and use (also phones), map books to find in totes behind seats, weather meters, cool drinks out the fridge etc - talk to crews on intercoms and even by poking your head out of the window - or getting off. Landowners and farmers hooting around to pull up next to and talk to (possibly having to get out, getting out to assist crews, liaise with other crews etc. etc.
And even the driver can be continually exiting and entering the vehicle.
Is it really that realistic to think that these people will remember or even be able to wear their seatbelts at all times? And their crew on the back are standing up on a moving vehicle fighting running grassies.