Growing up in South Bend, we'd see hundreds of these leaving town on trains fairly often. The post office used to sell their used ones for $200. It was fairly common for newspaper motor route drivers to purchase these. There were usually 2-3 of them sitting in the back lot of the post office for sale at any given time.
Jeep DJ - Wikipedia
After high school, while I was attending tech school, I had a job delivering vehicles from the AM General plants in South Bend and Mishawaka to rail spurs for shipment. The Mishawaka plant was only new Hummers, and rarely needed our services as they had their own rail spur, but sometimes needed to move more product. The South Bend plant at the time was building new small vans for the US Postal Service. They had rail service, but it was tied up with military trucks, so we'd drive the vans out to remote locations to load on rail cars for shipment. AM General had a contract to refurbish 5-ton trucks for the government. They'd haul in the old ones, tear them down completely, refurb and reassemble. As I recall, it cost about 2/3 the cost of a new truck, and was a very successful program and saved quite a bit of taxpayer money VS new. We'd drive the 5-tons out like the mail vans to remote locations around the area. Sometimes we'd take a diversion with the 5-tons and take them on the off-road test area behind the South Bend factory. That was fun.

As I recall, they had 5-tons in flat bed, troop carrier, dump truck, wrecker/crane and probably a couple other configurations.
All were open cab and we drove year-round. Driving down the highway at 55mph in an open cab dump truck where the overhanging shield from the dump bed was a giant scoop that forced air down your back and pushed your head forward into the dashboard in the middle of a northern Indiana winter is when you question your life choices.
They also brought new hummers from Mishawaka to South Bend, where they'd add things like ambulance bodies, missile launchers, turrets, etc... and we'd ship them out as well.