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.  

Why drive for dollars when there is an army of service drivers running the streets everyday, UPS, Fedex, lawn guys, drug store delivery guys.

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!