When it came time to take delivery, the headboard wouldn't fit up the stairs, and the crew wouldn't winch it up over the (2nd story) balcony (of a 6-flat).

I'd stand by them having to deliver. I

@Adrian Smude the Options I have considered is keeping the rental and my primary residence and taking out a home equity loan or a line of credit on my properties or selling the house to te current tenant who has expressed interest in purchasing the house.

If they do not agree with this then you remind them (and hopefully your lease expresses this) that they had a chance to review the rental unit twice and agreed to rent it "as is".  

I'm looking at the different delivery methods of real estate classes & was wondering if there is such a thing as those classes on audiobook.

It is calculated as an individual's monthly housing expenses divided by his or her monthly gross income and is expressed as a percentage.'

Don't just assume they don't want it, see what plans they have and if they express interest in selling let them know you're willing to "take it off their hands" Good luck!

Has anyone used Real Estate Express online to get their real estate license?

I definitely recommend Champions School of RE for their live classes and I recommend against Real Estate Express for online classes. 

I read Brandon Turner’s book on Rental Property investing as well.I also stayed at a Holiday Inn Express last year.That’s about it.