An Eagle Cap Camper Snapped A Ram 3500 Dually In Half, Mopar Refuses $17,000 Repair Bill

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A 1/2 ton truck is just that it can carry a 1/2 ton…1,000lbs.
It was worse than that back in the day. Some of the light duty trucks in the '60's were no better than cars. By the time you got two-three 200 pound men in the cab, and threw a bit of camping gear in the bed, they were often to gross weight. The drive trains were often no better than pass cars/ station wagons.

Some of the early 60's Chevs had TORSION BARS, and Ford and ?? GM?? don't remember made light duty UNIBODY pickups

When I was stationed at NAS Miramar, we had a delivery guy from a local downtown machine shop/ parts store drove one. They had damaged it carrying engine blocks, etc, and it had huge but metal plates bolted from the "cab" area to the front of the "bed" area scabbed across to try and control cracking. And San Diego is not a rust belt area, either.