While people mentioned the possibility of this, I would not recommend it. I'm not a lawyer but in other discussions I read about them, It was raised that this action could be seen as tax avoidance and be subject to legal action. It was also raised that with the Single Shot Trust, there is also no way to remove yourself from it. So the theory was that if you add someone to the trust to sell them a suppressor then you also may be liable for anything they do with it.Obviously talk to an attorney, I believe you can do a single shot trust. That would allow you to sell said suppressor to someone without going through all the regular red tape. The reason is you are then selling the trust.
That is the way it was explained to me.
In short, strongly recommend against trying to use a trust as a way to sell a suppressor, or any NFA item, without going through red tape. A trust is a great way to share with family or very close/trusted friends, but not to sell them.