Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

You will require many properties to completely replace your income, which could become a new full-time job to manage.

This is the super's job - that's what you are paying the HOA fees for.

Considering some SFR properties in Cahokia / Cahokia Heights, Illinois and looking for some recommendations on inpsectors in this area that do a good job looking at multiple properties

If your student loans are only 3-5% interest, that's pretty good so I think it's okay to pay those off over time.It sounds like you're making good income with your current employer and there is room to grow, so I'd plan to stay with that job until you can pay your high interest loans off and save enough for a down payment for your first property.

Close proximity to national parks is also nice. 

That continuous flow of new nice properties wouldn't hurt your valuation, since they can go into something brand new instead of something that is 3 years old?

Well reviewed and my  management processes in place. and one of the nice things, I am out-performing my neighbors and close competitors by 20%. all with only the knowledge from here and from Avery's book

Nice work!

Even tough, I am in information overload right now and working a full-time job at night.