Help finding 'compliance plate'

Hello there. We sold our 1963 Airstream Bambi to a couple overseas. To import it, they're asking for a photo of something called a compliance plate that will have the GVWR weight.



I scoured the Bambi today, but only found the VIN plate near the door. Can anyone point me toward the compliance plate or the GVWR?



Thank you for your help. Cheers. ... Deldog