Having several units in 1 LLC will not protect them from creditors if there is a judgment against 1 of the properties that resides in the LLC with the rest, but if your personal home is outside of the LLC that should be protected from lawsuits.

However, you could always try to negotiate with the judgment creditor to see if they'll accept a reduced payoff. 

Would I be better served to use cash as down payment for new properties or pay off 1 property and get a line of credit or cash refinance that would be more than enough for down payment of new properties.

I would think the court would want to make the creditors as whole as possible and selling the property is the only way to do this.Have you gone through a process like this before?

An attorney can place deed restrictions on title to protect your interests from the seller's creditors or keep the property from being encumbered. 

There is a process of  getting a release from the trustee for the surplus funds because they have to determine all parties who may have an interest in those funds; creditors, heirs, tax bills, etc. 

Mortgage lenders, judgment creditors, IRS--they all have redemption rights they can exercise in order to protect their liens. 

That said, yes payment for child support can be collected from probate assets and has the position of a secured creditor. 

And insurance does not protect you from claims by creditors, such as workmen who are not paid for work on the property.  

@Jay Hinrichs  at around 90 days late the bank files a Lis Pendens with the court, and is published in the newspaper 3 times notifying creditors of pending action.