My old department got hand-me-down trucks from the Texas Forest Service that we converted to brush trucks. We also got a 5000 gallon flight-line fuel truck from them that we converted to a mobile hydrant. The one "new" truck we bought, we bought as a used truck from a department in Chicago and had to take out a loan to pay for it. The bi-annual fundraising BBQ we held covered operating expenses, but that was just about it. Everything else came from handouts from the government.
The radio system? Patched together with stuff my dad & I bought at hamfests.
And there was more than a few times during the summer and we were fighting multihundred acre brush fires that I wish I knew exactly where each truck was, how much fuel and water they had onboard, and be able to set a waypoint for them to drive to for their next task.
That may not have all been able to have been done with an ad-hoc wireless system, but that would have helped immensely.