Many of your recreational campgrounds are owned by the government (either state or local) and almost all of them do not allow you to stay more than 21 days so if you are running a long term park there is a very high demand in many states. 

Because real estate get's greatest governance and impact at LOCAL level, not state.     

The seller of the property won't accept government loans as well so a FHA is out the window.

Unfortunately, that won't matter as  Fannie Mae and Freddie Mac, the Government-Sponsored Enterprises (GSE’s) that set the guidelines for conventional loans, which most lenders follow for other types of loans, too, require that a condo building’s master hurricane insurance policy provide 100% coverage of the replacement value for the building. 

I don't charge for pulling a permit, i get reimbursed for receipts paid to government entities.

In the commercial & private money world its all fair game and case by case.Use of credit cards to purchase properties to acquire/capture equity, create, cashflow, provide additional tax shield/benefits against your income, and improve your real estate investing venture is definitely one way to go about it but it should not be the sole method since there are risks like many have mentioned above.If you're using business cards (linked to your FEIN - federal employer identification number) and it doesnt report to your personal credit then it might be more prudent credit wise because your Fico scores won't tank when you max a business card out versus a personal credit card (drop of 80-100 fico pts temporarily till you payoff).So with prudent timing (funds seasoning), knowledge of how to maintain your ficos so you still qualify for your cheaper conventional money, and how to use the cards to purchase can definitely expedite your REI journey.Most people I encounter would not have the know how to do it correctly as I see plummeting fico scores, in ability to qualify, and many other issues with using cards to invest on a weekly basis.Best of luck,

10) Make sure all of the above, and more, are compliant with Fair Housing requirements, Fair Credit Reporting Act, Federal privacy laws, etc?

So they need to be real estate focused or at least well educated in the "game" our government has setup for professional real estate investors.

However, there is such a thing as a self-directed solo 401k plan which is very popular for those who are self employed.Following are the similarities and differences between the solo 401k and the self-directed IRA.The Self-Directed IRA and Solo 401k Similarities Both were created by congress for individuals to save for retirement;Both may be invested in alternative investments such as real estate, precious metals tax liens, promissory notes, private company shares, and stocks and mutual funds, to name a few;Both allow for Roth contributions;Both are subject to prohibited transaction rules;Both are subject to federal taxes at time of distribution;Both allow for checkbook control for placing alternative investments;Both may be invested in annuities;Both are protected from creditors;Both allow for nondeductible contributions;Both are prohibited from investing in assets listed under I.R.C. 408(m); andNeither may be invested in your own business.  

Banks are regularly visited by federal auditors and work hard to keep in compliance with properly handling transactions.