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Possible but unlikely. The military didn't 'marry' a lot of used stuff onto trucks except at the unit level.
In your case, that load would seriously limit the vehicle off-road due to placement.
I'd wager it was done by a previous civilian owner. Plus, you're looking at a truck and system...
Your box was a very special, almost custom, shelter designed just for a particular radar project. As shown in the photos, it was quite a complex group of several items to move into a combat area and set up. Your shelter most likely came from a decomissioned radar system.
Radar companies like...
https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195729/ancpn-4-ground-controlled-approach-facility/
https://www.armedconflicts.com/AN-CPN-4-mobile-ground-landing-radar-system-t123160
As said, I don't think your truck was originally part of this radar system...