And particularly in large multifamily, there are systemic risks that do not make the risk worth it for most deals, in my eyes. 

Develop a knowledge base and system.   

In addition, I am considering changing my furnaces/boilers to have plug-in cords instead of being hard wired so that if there is a power outage in winter that I could power that heating system with a portable power station.

The main use of the extra revenue is capital improvements; new roof, furnace, monitored fire alarm system, etc. 

Systems.

All things being equal on the asset side, the operation and systems put in place will make or break the performance of the investment but at this point that has almost nothing to do with real estate. 

Our thought is a bunch of $.06 per minute charges on your credit card would be too many line items on your CC statement, so by default the system will reload your account in $50 increments (you can change this to any increment)In the dialer interface, I thought we displayed $99 for unlimited minutes as an add-on to the main app as an alternative to pay per minute.

You can argue I need a property management company and that I’m too lenient but this system is working for me.

Since you plan to travel often, focusing on systems and building a reliable team: agent, lender, property manager, and contractor. 

I would argue that they are young so they haven't been burned by bad landlords or even know how to take advantage of the system.