@Stan Butler
Think of your question differently and it might come to you. Why would you put stocks in an IRA when you can hold real estate instead?
The tax circumstances between an IRA and personal funds are very different. The goal for the IRA is to invest in the safest possible asset with the potential for solid, consistent returns. Real estate and notes fit that bill nicely.
@Timothy Riley
It sounds as if you are trying to build the LLC yourself. That would likely be a mistake and could result in at best a lot of frustration with a custodian not being willing to accept non-compliant LLC documents or at worse a prohibited transaction if the LLC is not structured properly. There are several professional firms that specialize in this service and provide high quality education (not SDIRA Custodians, but advisory firms). The tool (IRA LLC) is one thing. The knowledge to properly use the tool is the key. As you note, even your sage mentor is in the dark on this specialized topic.
You could not have an IRA hold a unit of a personal series LLC, if that is what you are asking. In fact, we do not recommend a series LLC in most situations as there is not any sufficient case law to prove the isolation of cells will hold, and in most states there is no cost difference between a series LLC with 2 cells and 2 separate LLC entities.
There are many exit strategies. You can continue to hold property and draw off the income, distribute the property in-kind or sell the property and allocate the cash differently - reinvest, distribute partially, etc.