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Should I be concerned that the husband has no credit history (I'm wondering if this is indicative of past financial hardship/bankruptcy)? 

First, let me just clarify that my comments below are as a user and not indicative of any BP policy whatsoever - I'm a moderator but also just a guy with houses :)As a guy that was on the original podcast, I'm looking forward to @Dave Meyer's contributions.

I now have 10 rental houses, am looking to move to small apartment buildings and am a basic member at Lifestyles Unlimited, which I also find to be worth the minimal membership fee.  

If you could indicate how many doors you have and how much you pay that would be awesome and very much appreciated.

I've tried to buy decent properties in decent neighborhoods to minimize my risk, which also means there's not a TON of monthly cashflow, but I'm in it for the long haul and really truly looking for passive income or at least as passive as it can be. 

I’m just saying do not minimize what he is making.

The answer above from Joe indicates he would be a good place to start.Remember: cheaper doesn't mean you'll make more money.Start by going to www.narpm.org to search their directory of managers.

I understand that a rental listing will not generate as much as a sale would, but I think a minimal standard should exist (especially since I plan to buy properties in the future).

I believe that this approach minimizes downside by exploring the numerous currently for sale opportunities with assumable mortgages.