This 1031 Exchange Calculator can help you model out the taxable proceeds based on various situations. 

Kudos to you for doing something to create a secondary income stream. there are 5 income streams in RE rentals, possibly six if you do things a certain way.The reality here is your model (buy box) is suffering from too high an entry and too high a cost of capital.

While the home needs to be paid for prior to delivery in many cases, the transport companies carry the insurance from the factory to the site. 

I’m not suggesting a person change their business model entirely, but usually a person either deletes something or adds something in order for a different outcome or at least a more modified outcome.What’s your thoughts?

I like your model for the start and end dates for your units.

I would like to think it is worth it, and that I could run a business model that serves fewer customers really well rather than deliver basic services at scale.  

You know the model and have systems so tapping into your equity is a smart move.

One being a wholesale model, the other I call the profit maximizer.  

If there is someone's busines model you aspire to, see what they are doing.

You get to show buyers the same models over and over and do not take people all over town.