This is a great example of why it pays to consult with an estate planning attorney. Generally, I prefer to have the executor(s) and the trustee(s) be the same person for continuity. However, there are circumstances which might direct you otherwise. It would be well worth the time and expense for you to at least discuss this with a local estate planning attorney.
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By Trustee, I presume you mean a successor trustee who takes over after you are gone, right? I agree that a successor trustee and an executor can often be the same person, but sometime might best be different.
I agree with the prior advice that you might want to spend a few bucks to make sure you get all of the aspects of the will and trust mapped out correctly.
The above is not intended to be legal advice, but may be used for general information. Please contact an attorney for specific help tailored to your needs.