Not very familiar with the 55.1 but I think you are correct in believing the its all panels. It is not uncommon to find all sorts of things welded or bolted to these trucks. Take a close look and determine what it is. A good grinder or cut off wheel can slice through the welds so you can get it apart. Let us know what you find.

It'd be nice to check out the online manuals and review the assembly manual. They sure come in handy for lots of things.

http://chevy.oldcarmanualproject.com/


1937 Chevy Pickup
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1952 Chevy Panel
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1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile