For those I'm on the fence about due to a credit score I've requested bank statements to ensure they can adequately cover the rent and are responsible with their income. 

But a great contract will ensure that you can win if you do have to go.

https://www.biggerpockets.com/blog/ensuring-solo-401k-compliance

And of course your primary stated goal if questioned isn't to have them out, it's to ensure there is no possibility that they still have stuff in there when the cleaner shows up, you want to ensure nothing could possibly be stolen.

To ensure the seller gets all of their money, put in a 100% prepayment penalty clause in the loan.  

Then when you scale up to 100 units, the work is actually LESS because a 100-unit apartment complex can afford a full time property manager and a semi-full time maintenance manager. 90% of the drama is gone and all you do is manage the property manager and ensure you increase its value through smart capex.

I should have vetted contractors better to ensure there was no grey areas on the scope of work.

After transferring the property to the land trust you would assign the LLC as the beneficiary to ensure it remains protected.

Ensure that the amount due is either a.) credited to you on the the closing statement, or b.) paid by the title company from the seller's proceeds at closing.Whether service has been shut off for non-payment or by request, as long as the water company has record of a meter present at the property, charges continue to accrue.

Ensuring a speedy sale.