Everything on my side was set to close, and then today the seller is refusing to close on Monday as they have not moved a few pieces of furniture they were supposed to get movers for.

Best way is to just try to break it down piece by piece.Water- how is it being delivered to the homes. 

If you’re worried about exposure, consider running promotions or competitive pricing early on to attract bookings.

I've read J Scott's Books on flipping and gone through the Youtube rabbit hole but I feel like I'm missing a piece.

Don't split the work between multiple contractors if possible, finding one to do all or most of the work will keep prices down.Challenges were finding replacement pieces for certain items as manufactured homes were very different than stick built as well as going through state guidelines for affixing the house to the land

From there, adding discipline will get you to where you want.Instead what you're doing is advertising you have money, no knowledge and are going to have the average BP RE agent(bottom of the barrel quality) come here to promote their services with no regard. 

Some piece of communication is missing.  

One thing you might think of doing is having and promoting your own website to avoid the exhorbitant fees charged by the third party sites such as Expedia, Booking.com and Air BnB.  

My wife and I are looking to purchase a piece of vacant land from her parents. 

Show a solid performing AirBNB and then punch out a list of prospecting for arbitrage and also promoting yourself as a co-host.