Discovering BP has played an integral role in providing me with valuable resources to make decisions and creating a business model.  

The IRA LLC model has been around for more than 20 years and has been tested in the courts.  

You want a flat fee / fee for service model, not a model that is based on the asset value.If you qualify for the Solo 401k and would have other reasons to take advantage of such a plan like the desire to make higher contributions or other investments, then it might make sense to explore that platform.You don't need the checkbook control of the IRA LLC or a SoloK for a single land asset.  

A "Supply-side" economics model, in a way.  

The benefit of using an open input model like excel is that you can adjust prepayment levels of the loan which if the loan is purchased at a discount will have a direct impact on your IRR.  

That said, real estate investors here usually go for a long term appreciation return due to a break even or even negative cash flow model on a 20-25% downpayment.

You learn so much, and it helps you start to develop what your business model could look like.

I was intrigued but actually I knew nothing about trailer parks so I called in a buddy who owns a few.We go by the site and the trailers range in age from late 1970s to newer 2000s model homes.

In a nutshell that is primarily my business model and works great! 

When you become in bankable in a traditional financing model, you have to start to think creatively!