My goal is to build a Rental portfolio to supplement my income in the next 5 years.

If you have not been supplementing with D-3 (your multi is too low, only 4-800 IU) previously take 50,000 IU a day for 5 days.

You certainly can edit a post; the "Edit" link is just to the left of your post, but it only allows an edit for a brief time (10 or 15 minutes); after that time it changes to an "Update" link where you can only supplement or explain the post.

I am looking to get started in REI to supplement my retirement savings and have some additional post retirement income. 

My wife and I try to supplement as much of our living as we can through Costco.

What is tenant doing (planning to do) to supplement income if they expect to have income loss?

While the cost of actual ownership due to interest rates may be lower than historical averages, you still need to get there first and purchase the house.My attempt was/is to supplement your analysis. 

This info will give you a decent idea of what to expect and help filter down your search to a few cities.Some of the metrics that I find valuable to understand are:- Population - Home Values- Household Incomes- Rental Vacancy Rate- Homeowner Vacancy Rate- Poverty Rate- Educational Attainment Rate (High School/GED & Bachelors)- Number of Housing Unit- Rent to Income Ratio- Rent to Price Ratio- Population on SNAPS (supplemental nutrition assistance program) percentage- Property Tax Rate- Median Age of Buildings- Number of Structures by Units (SFR, Duplex, Triplex, Quadplex, etc...)- Median Rents by Number of Bedrooms- Unemployment Rate- Employment Sectors Percentages These are just some of the indicators that will help you understand the quality of an area as well as the kinds of returns one is to except.

What is the risk tolerance that’s required in Dave Ramsey’s portfolio to achieve the returns that will grow his assets enough so that just a 4-5% withdrawal rate in retirement will suffice his supplement income goal in retirement?

You can argue that nobody stays on welfare for $1,000 a month but the truth is there are a lot of people that take that $1,000 a month and then spend their free time hustling for cash, dealing drugs, or otherwise supplementing their lifestyle without Uncle Sam knowing.I used to work for the state.