Can you add some description to the drawing? I am having a hard time envisioning what you mean.

Here is an example of how it is often done. The red circled "posts" are the cab mounts. They are bolted/welded to the frame and gusseted to provide strength and rigidity.

The bed mounts stretch across the back.
Attachments
IMG_20240217_194919.jpg (19.97 KB, 74 downloads)
Custom mounts


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