For example, could I use my SDIRA to operate a management company that charges my holding LLCs a management fee?

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

Here is what the IRS says on the subject: Election for Husband and Wife Unincorporated Businesses A business owned and operated by the spouses through a limited liability company does not qualify for the election Only businesses that are owned and operated by spouses as co-owners (and not in the name of a state law entity) qualify for the election.

@Kim LeduffIn our experience, the #1 mistake owners make when selecting a Property Management Company (PMC) is ASSUMING instead of CONFIRMING.It's often a case of not doing enough research, as they don't know what they don't know!

With your experience and possible skillset, perhaps finding a company to sponsor you for a green card may be a better option? 

Unfortunately, the septic company is taking their time, and I’m still waiting for the replacement to be completed.

Another work around that isn’t discussed much is working on a strategy with your insurance company to protect your other assets in the event of a claim.But also, it wouldn’t be a bad idea to consider getting the financing into your LLc name with a community bank and pulling cash out if you have substantial equity.Right now, since the loan is in your name, it shows up on your personal credit report.  

Brett,I have never heard of that company but any reason why your not using an FDIC Bank or well known lender? 

I run Blaze Real Estate a property management company in Amarillo.

You can put a mortgage into a "trust: without triggering a due on sale but again contacting your bank/lender is the best route to avoid any issues.Some banks/lenders or servicing companies change guidelines and even a trust may require other paperwork but the attorney usually facilitates that to be safe.