I also look for lawsuits and see what happened in them.

Run a background check and evaluate the SAME way every time to avoid Fair Housing lawsuit.

Do you have any recommendations for setup of these Trusts and LLC's with operating agreements that are iron clad so creditors/lawsuits cant get to other parts of my life?

The tricky one is the rent to income ratio and how it is related to the median family income.I did note that at lease one other poster was advised to always use the low barrier screening criteria to avoid potential lawsuits. 

The house has two kitchens (one is a mother-in-law suite), 3 bathrooms and is approximately 1600 sq ft.

Your husband's business is an active one and perhaps more prone to a potential lawsuit.

I'm mainly looking for a small multi-family or a single family with an in law suite or an ADU.

What if the arbitrager and the LL are named in a lawsuit?

This can lead to a probate lawsuit in the future.  

One of my first inquiries on BP, two years ago, Avoiding Bias. How do other investors do it? (biggerpockets.com), yielded more advice than I had anticipated. Since then, as an investor, I have remained interested in t...