That's a very nice truck. From the pictures it looks to be very clean and little to no rust. You have about $1000 in accessories too, with the litter, siren and lights. Do a major detail on it and drive it like a suburban. Should get about 13-15 mpg with the stock motor and gears.
They claim it to be a 3/4 ton, is that correct? I am not sure about this series of trucks. I can find one tons and half tons and this one looks to be a half ton.