What type of loans are appropriate for business owners and self-employed individuals to scale past 10+ properties? 

Others do a 90/10 agent/firm if its their own lead.

Then follow those concerns with solutions, such as having a system in place for tenants to make maintenance requests (including in emergencies), why all of your spare time won't be consumed by these investments, being properly insured against hazards, etc.Your wife doesn't have to be passionate about real estate like you are but if you address the concerns upfront, it's much easier to get the ball rolling in the right direction.

In my case, I have residential rentals in one LLC, commercial properties in another, self storage in a third, and my real estate company operates in a fourth.

My partners and I have purchase 2 KMarts, 4 warehouses, 2 mills, and a grocery store that have been converted to Class A Climate Controlled self storage facilities across the southeast, currently $160 million in assets under management at stabilization.

As such the profit is taxed as ordinary income subject to self-employment tax. 

Its literally the exact same thing as a self pay tenant, except like Bob said just requires some paperwork and an inspection.

These are just tips and examples to get you thinking in the direction I took and maybe you'll see a path.  

Thanks in advance for any help, direction and advice.

Your profile mentions that you ahve ownership in an LLC - WoodRich Hospitality Services LLC.If it is a multi-member LLC, there may be a separate partnership return required.If it is a services based business, there may be a benefit to operating it as an S-Corp to save on self-employment taxes.