Naming a trust as beneficiary will give you maximum control over your tax-deferred money after you die. That’s because the distributions will be paid not to an individual, but into a trust that contains your written instructions stating who will receive this money and when.
For example, your trust could provide income to your surviving spouse for as long as he or she lives. Then, after your spouse dies, the income could go to someone else. The trust could even provide periodic income to your children or grandchildren, keeping the rest safe from irresponsible spending and/or creditors.
While you are living, the required minimum distributions will still be paid to you over your life expectancy. After you die, the required distributions can be paid to the trust over the life expectancy of the oldest beneficiary of the trust.
The trustee can withdraw more money if needed to follow your instructions, but the rest can stay in the account and continue to grow tax-deferred. You can name anyone as trustee, but many people name a bank or trust company, especially if the trust will exist for a long period of time.