I don't want people to waste their time & apply if they don't fit the bill above. 2) After I get applicants, how do I shortlist the top ones & send them the link to do get their credit & background checked through Cozy (I know the technical aspect of how to actually do this, but I'm asking for about the shortlist process). 

I second what @Chris Seveney mentioned about considering the tax aspect and notes for your SDIRA.

However, is there a way to bundle all of this income and put it under a business umbrella to show consistent income?

Any loose cracks or pits I would fill with a thicker consistency of the resurfacing mixture or concrete. 

Its great you have connections to assist with the every day - right now, though, while you're looking at the financial aspects and wanting to make sure the numbers work - connect with local REI professionals such as real estate agents, property management teams, and lenders who can help provide insight to the market, as well as what they observe others are doing in the same market also.The majority of the folks we work with now are out of state and the number one issue is finding the right market for their REI model... and then finding lending... being able to run comps and assess your numbers will be key in making sure you buy successfully.

Look for the ones with the most members that consistently meet when they say they are going to.

We've had a few tenants fall behind, but through some respectful guidance and consistent communication, every single tenant I have is paid up. 

Details of the property: Property consists of a 29 unit storage unit made of cinder block and metal roofing and two single wide trailers.

Your post made me think of something I read a few weeks ago from Howard Marks:-there are few if any facts regarding the future,-the vast majority of our theorizing about the future consists of extrapolating from past patterns, anda lot of that extrapolation – and just about all the rest of our conclusions – consists of what Lipsitch calls opinion or speculation and what I call guesswork.

It's a book on negotiating and the human psychology behind all aspects of how a negotiation works.