did some due diligence on this at the time and an old hand in the a/c insurance trade told me there has never been a problem with trusts but there could be if the trustee died. In that case you can continue flying etc but you might have problems (or face a delay) selling the plane. This seems to be the only risk.
The trustee does not have to be the only person who can sign documents on behalf of the trust.............if you can sign "your own" documents then you can execute a Bill of Sale.
There have been problems with individuals owning N reg aircraft "on behalf" where fallings out have led to documents being filed that were not mutually agreed..........
If you value your asset then a reputable trust is the only way.