One trust can have as many bank accounts as you want, in as many banks as you want. However, it is also recommended to have a different trust for each different asset.
A separate note unrelated to the trusts, though, is that a much safer banking system is coming. Some say it is already here. The RV is just a part of this new worldwide system which is asset-backed and which would make FDIC much stronger, or even redundant and unnecessary.