Be diligent and check their rental references, credit report, eviction and criminal reports and I like to suggest setting higher than normal standards.  

Btw, look at their consumer affair report to make a point :) https://www.consumeraffairs.com/finance/cenlar-central-loan-administration.html

The payments he receives will be interest and will be taxed as Interest Income, reported on Schedule B as "Seller Financed Mortgage" and included in his other income on Form 1040.  

Would my brother-in-law be liable for any taxes or if he didn't report it at all, could it trigger an audit for him?

Brisbane is reporting good growth with maybe some legs left in the right areas.  

Hi BP gang, just stopping in to introduce myself. My name is Matt Evans, and I'm a new entrepreneur currently spending half the year in North Carolina and half in Florida (I'm only 43, so I don't yet have quite enough...

Owner financing can be a great deal but it can also mean the owner is not prepared to show you the full financials (they often done have them and under report income to the IRS) or there could be some 'surprise' infrastructure or other issues that an appraisal and professional inspections will uncover but a quick OF due diligence period might not.Definitely talk to city/county officials to see if permits are needed to operate the Park.  

He continued to explain that he didnt like these kind of cases because there was no police report and no other proof except what his client said.

I don't make up the rules, just report them.

If they never delivered that service to you, absolutely report this to your credit card company...It's hard to say real estate guru offerings are "scams", as they offer a service and provide some real content and they have some (a few) who have had success with their programs.