73 C-50 questions

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I have a 73 C-10 with a van body. The door sill has the GVW info on it. See attachment. Two problems.

1. The GVW is stated as a range 16000-24000 lbs

2. The DOT wants GCVR rather then GVW.

I can drive the truck without a CDL. But if I pull a car trailer with it I maybe in trouble. GCVR must not exceed 26000 for private use in Oklahoma. How does one figure out our find out GCVRs ? Last resort is to talk with the DOT.

Recently another member posted a data plate from his C-50 that listed what parts they used to build it (like axle size etc). Where should I be looking for that.

Thanks