Mobile home parks can be very profitable, however be sure to understand the different models.Park owned homes, is where you own the land and the mobile home.

While using financing does mean I don’t keep 100% of the profit due to borrowing costs, it allows me to take on multiple projects at once and operate in higher price ranges than if I were only using my own capital. 

In my opinion, it's at the far end of the un-sexy-but-profitable scale.

Consider offering equity partnerships, debt financing with profit sharing, or preferred equity, where investors get a fixed return before you share profits.

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

Are there some investors who are making enough profits to participate or are these new investors? 

And my rental cash flow went from only $1500/month to 19k/month profit by taking on more loans and harvesting the equity in some of my properties including my primary.

Start small, ensure your numbers (purchase + rehab + holding + selling costs) leave room for profit, and build a reliable team (contractor, agent, lender).For financing, work with lenders who specialize in fix-and-flips. 

With your boots-on-the-ground approach, you’re in a strong position to find profitable flips.

I may have some ideas.The 100k would be their profit from the sale.