It is not “everyone in your trust”, it is all “responsible persons“. A beneficiary is not a responsible person, but other trustees generally are. That is why my advice is to have a trust with just a beneficiary so that you don’t have to dick around with paperwork for seven trustees each time you submit for an item which is cumbersome, impracticable and unnecessary.
There are two ways around that: first is to have a trust eg “gun trust #1” that you fill up with a certain number of items - say five 10, 20, whatever - then add trustees or other responsible persons as an amendment after their stamp approval, but don’t add other items to the trust through the ATF after the date of that amendment,. To add new items, start a new trust such as “gun trust #two” or whatever. Rinse and repeat ad infinitum
The other way, according to one of the original, and most prominent lawyers providing gun trusts, is to make an amendment, say, amendment number five, that removes all of the trustees prior to submitting for a new item. Then after the new item(s) is approved by the ATF, make amendment number six, adding the trustees right back on. It is obviously a loophole, but apparently the ATF can’t do a damn thing about it according to that lawyer.