It can be done but your getting into state and Federal laws governing securities.

Find a job you enjoy, and pays decent and invest for 10-15 years and you’ll have more money then you can spend $12,500 @ 5.63%$10,800 @ 5.88%$8,600  @ 3.63%$28,000 @ 4.27% (group of federal loans)My plan was to pay the required amount on each and throwing extra at the highest interest, unless I should save the extra for a down payment or repair money?

Where else does one get the lowest rates fixed for 30 years to go buy assets that can perform and cashflow meanwhile the lender has the debt guaranteed by the US Federal govt?  

Coastal federal credit union is one with a lot of good benefits and it’s available for the general public as well.

Unsure about the federal tax consequences --- that's a CPA conversation.You can do either a partnership or S-Corp.

If I understand it correctly, she will have to pay taxes on the selling price minus the purchase price, cost of any improvements, and 500k federal exemption.Are there any other strategies which could be employed to reduce the tax burden?

I have a guy (with 4 yr son) whose background checks indicates 700+ credit score, stable federal job (3X salary vs rent) for last 8 years, good references from past 2 landlords BUT had chapter 7 bankruptcy that was discharged in 2013. 

Do not say anything that might be Federally be looked as possible discretionary language. 

Your State's manufactured housing association is best suited to answer that question, since they can give more color to the federal statues and whatever your state laws say. 

But it's not protected under the Federal Fair Housing Act.Here's a link to what's protected under the Federal Fair Housing Act:RaceColorNational OriginReligionSexFamilial StatusDisability   Even apartments.com's own Terms of Service don't seem to prohibit what you posted (again, as long as you didn't reference source of income):Compliance with Fair Housing LawsAll Content is subject to federal fair housing laws, which make it illegal to indicate in any advertisement any preference, limitation, or discrimination because of race, color, religion, sex, physical or mental disability, and/or familial status.