The mobile machining and metalworking military trailer, or SEGPRSM (Shop Equipment, General Purpose Repairs Semitrailer Mounted). Around $10K on a government auction site.
Manual: https://diqn32j8nouaz.cloudfront.net/segprsm_manual.pdf
7:11 video:
Previously:
South Bend Lathe traveling machine shop - photos
Mobile machine shop - photos and video
1950s lathe salesman's car - photo
Mobile auto repair station - GIF
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