Steve,
I drove the 1970 T-80 Chevrolet that was on eBay home...820 miles with no major problems. It cost me about $800 to fly two of us out and drive it home (air plane tickets, food, gas, one night lodging and the cost to UPS my 80# tool box out the week before). The truck came with two good spare tires mounted, new gas filter, new 2-speed shift motor and switch, new plugs, wires, points. It rounded 50K miles on the way home.
What motor does the GMC fire truck have, the 637 V8? Sounds like a good deal for $800.
Mike B
