Wondering if MH Manufacturers would be interested in putting their homes on the park to sell them and we would just take lot rent.

They used both new manufactured units and modular units on this project. 

I believe the manufactures are in the rental business, if it's feasible for a even a small fleet like 6, I'd say they'd already be there.

He highly suggested me doing the same - VRBO for manufactured units.  

Migration of technology companies, business services and manufacturing firms to the heartland is likely to accelerate.Completion of Nationwide High-Speed Rail System.

That is only going to go on for so long.I am old enough to remember when interest rates were something like 18%, I remember a decade or so later buying my first house on an adjustable rate of 10.6%, and was ecstatic at how low the rate was.As far as real inflation, a big reason for low inflation over the last 20-30 years has been the offshoring of manufacturing to emerging markets like China and India. 

You can wave around 30 year amortization schedules and HELOC daily balances based on payday timing all you want until you confuse the heck out of people but it doesn’t manufacture money out of thin air.

Go with double hung and insulated windows. crystal windows has good stuff down here in the city, but I’m sure you’ll be able to find a good manufacturer upstate.

Also, if you are selling a manufactured home, the FHA requires the seller to pay for tie-downs ($600-$1000).

Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest.