max towing trailer weight for a 1971 c10 suburban

[38chevyhotrod]

I want to get the max towing/trailer weight on the new title here in holland.
Therefore i need an official document.

To get that document i need a few papers.
This is what they ask for.
"I require the option codes on your truck, I believe on the fender under the hood and any GVWR labels"

I don't have them for my Suburban.
Can someone scan them or photograph them.
I have a 1971 C10 suburban with a 350 engine, it originally had a 3speed.

I do have the glove box but i don't think that's enough.