When I worked for the highway department in the early 70's, the maintenance shed had an old Oshkosh 4X4 truck. What a monster it was. No power steering, only marginally boosted brakes, non-synchronized transmission, and a huge in-line 6 gas engine. About 40 MPH top speed BUT, it would plow snow where nothing else would. They'd actually taken a small V-plow and modified the mounts to fit the truck. With tire chains on the front axle(for directional control as much as traction) and 5-6 ton of gravel "chips" in the dump box, it would plug along at 20 MPH knocking out snow drifts that would stop a motor grader in it's tracks. Most times it had a 2 man crew especially if it had the wing plow attached. The #2 man controlled the wing with a set of hydraulic levers mounted on the right hand dash. The operators switched places every hour or so since the thing was so hard to steer, the driver wore out quickly. In the summer, it was the "stuck mower tractor retriever" with 100' of cable coiled up in the bed.
When I lived in Cheyenne I saw what was left of an AMC Gremlin that was in a snowbank one of those big Oshkosh snowblowers hit...green and black snow all over the place, it ate the car right up to the engine..
These trucks seem expensive, but they will be used for 30+ years and have the potential to save lots of lives...
Along about 1974 the USAF crash trucks were getting pretty aged. The newest model the P2 was originally designed to have diesel engines (that's right engines, it had two). But SAC wanted that behemoth "NOW" and there were issues with getting the diesels. So they put in two inline 8 cyclinder gas engines. Worked okay, but just seemed a bit lacking. The P2 came out in the early 60's.
So, with the newest modely about 15 years old, and the previous generation dating back to the mid 50's something was needed.
The answer to that was the P4. An Oshkosh design powered by a rear mounted Cat diesel. The old P2 had forward and reverse options. The tranny was a three speed, I think. The P4 was a six speed manual with an electric clutch. It screamed, especially once the local base mechanics tinkered with it (don't all gearheads want to make things go faster?)
So what's my point? Oshkosh makes good stuff. Heck many of the crash trucks used by the military and civilian FD's are the offspring of the P4 in both form and performance.