As the Settlor of a NFA trust my name is the only one that appears on the Form 4 stamped copies that are always carried with suppressors. Should a trustee of the trust carry additional document from the trust naming them as trustee?
I keep a copy of all my stamps and the entire trust in my range bag. I've never had anyone ask to see them but it makes me feel better that they're there.
I scan all images and put them on my iPhone images (pictures) for one page docs like the front side of the form 4.
You could also scan the entire trust and email it to yourself as an attachment. Put that in an email folder that can instantly be pulled up on your iPhone.
"Here you go officer, now I'll be on my merry way."
I just scan all my stamps and trust into a PDF document and save them on my phone. I did the same for my dad. Keeps from carrying around a bunch of paper.
I keep a copy of my stamp and on the back is a photo copy of the first page of my trust that shows my name with each item. Ranges ask to see the paperwork every so often around here for some reason. I'm not very keen on handing over my phone to a LEO for any reason cause who knows when he'll return it so not a fan of the digital route.