getting MHs insured (the actual homes) is a challenge. 

Very repeatable and much less time intensive than actually owning the real estate in most cases.

But is that your actual revenue?

Markets are efficient, period.

This is far from the market I practice in but it would seem building and sitting on a few of these for 5-10 years could be quite a nice bump.I like the option to buy a 20plex, clear $10k/month and replace income.

Mastering off-market acquisitions, sharpening your sales skills, and structuring deals for maximum profit. 

That's actually an excellent idea .... do you know where I can get more info on how to rent out the land for passive income? 

Great appreciation market, low cash flow.

I'd actually like to hear your methodology on buying.

A lot of investors like Ohio due to the high cash flow markets of Cleveland/Dayton or the solid appreciation markets of Columbus.