***I am no lawyer and this is just how I was told and how I interpreted the information given to me***
My trust came with a schedule "A" and a "Property List". I simply added my suppressor like so....
Item 1: $10.00 (Original item when trust was created....aparently it must be funded to make it legit)
item 2: SPR/M4 6.8 Serial Number: xxxxxxx
I then changed the date at the top of the document to the day it was updated with my new suppressor. I kept the orginal signed and notorized copy of the schedule a in the packet the trust is kept in and added the updated documents.
I do not believe you need to re-notorize anything when adding new items. The trust somewhere should state that the settlor can add or remove items as they wish, therefore no other signatures are needed.