Have you ever stood next to the real truck???
I used to be a firefighter for the CFA for 11 years, these trucks in real life have airbag suspension that automatically lowers the back of the truck when the pump is engaged so help us reach the lockers.
There are also pull out platforms on the sides and rear to further help us reach.
These are not small trucks. Some are fitted with a four person bench seat in the rear of the cab (that's four firefighters sitting side by side).
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On a side note,
Down Region 10 way (my old haunt), LED's are pretty new technology, most pumpers and tankers are fitted with halogen mini-lightbars and with either strobes or LED warning lights.
Ambo's are the only ones rocking the "All red / All Blue" light flash sequence. From my opinion, it's a huge improvement as it makes it VERY clear what's happening.
None of this split head LED module flashing red / red alternatively which from a mere 50 metres away appears to be a solid light flickering at most.