As long as your IRA is not a Roth IRA and your 401k is not with a current employer, you should be able to transfer all assets to whichever structure works best for you.

I am rolling 401k over from a previous employer to fund the SD solo 401k.

Has to be with your current employer. 

You wouldProbably then need to pay Self Employment tax.  

If you end up starting your own business and getting out of your current job, you'll generally need to provide 2 years of self-employed tax returns to support your income.  

Also, consider that when you do employ a property manager they do not shield you from vicarious liability. 

@James Hamling The owner of Twin Cities Leasing gained his experience working at your employer many years ago.

@Brent CoombsThe issue I have is that when people keep saying they’re going to employ the strategy or show any interest you keep jumping in and saying “why would you get out of your low interest mortgage?”  

If they pay a tenant portion, I verify employment, hours, and wage, or if it's benefits, be sure you have documentation.

Major employers like NASA and Redstone Arsenal make Huntsville a stable market for real estate investment.Housing Market:Home prices in Huntsville have been steadily increasing, yet remain affordable compared to national averages.