Reg D 506 c requires that the sponsor verify accreditation status.  

If you have a mortgage the lender will require you to have insurance that protects the asset that secures the loan3.

Ugin,When you say permanent foundation it is required by Fannie Mae, FHA, VA and Freddie Mac that a manufactured home/Mobile Home be on a permanent foundation. 

I may have to get a variance for the existing dwelling unit's parking requirement, but I believe I meet all the SB-9 requirements.

I appreciated that they volunteered that I would not be required to go to them for repairs, but that they were there if I wanted.They are delivering it on Monday, December 11th, so I will report back with the verdict once it's up and running.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Many will also require a third party due diligence report from a company like Mick Law or factright (which they run around $30-$50k). 

Depending where your rental is in Chicago, you should also be flexible with your requirements.

At present, the filing requirement is back on.

Keep in mind that you will probably be required to sign a personal guarantee of the loans.