Not good.Having said that, we at times will install a property management company into a client's world so they can defer into an IRA or 401k by creating the necessary earned income.

If you simply want to "get involved in it" I would suggest seeking out local, licensed property managers who are hiring.

Sure, about one in 2000 times, by someone experienced enough to recognize a very unusual situation, having the capacity to act on it, having the financial strength, experience and tract record to be able to attract the needed capital, having the knowledge and ability to structure the deal, having the ability to manage and or reposition the property after purchase, and having the capacity to carry the negative cash flow until turning the property around or obtaining lower cost financing.  

I have a 60 unit storage facility with a U-haul dealer located in Edgefield, SC and I’m considering to get a management company to replace the ESS system i have.

Given how good the terms are, I'm surprised to read that they will work with someone that had a bankruptcy or foreclosure more than 3 years ago with a sufficiently compelling letter of explanation along with supporting documentation. 

I self-manage all my homes and the added workload from my current 18 SFH to adding 17 more "doors" could be substantial.        

You have solid assets, but you feel like you should be managing larger apartments that require way more attention, more management, more upkeep, and more annoyance.

We now have a Flight Attendant managing the house for us and keeping it clean and organized.

Low priced houses, low quality tenants, low quality property managers, low quality contractors. 

If you decide to go that route, hire an experienced management company and underwrite very conservatively otherwise you could get ruined by high maintenance & turnover costs and potentially evictions.