Structure - I would pick a marketing method that you can consistently afford for the next 3-6 months, basically until your first couple of deals, and just stick to that marketing channel.

Also, if an unpermitted space isn't done in a "workmen like manner " the appraiser might call out the area's that are poorly put together if it's a safety or health issue.

Once it will become too high pressure I will value my health more than the money.

Don't leave them in your property untenanted unless you can afford to get them stolen - ask me how I know.Feel free to PM me - happy to talk shop.

Can you afford to start losing money with your rentals?

Buy durable, affordable, replaceable products.

There are various affordable loans through Fannie/Freddie but once you get into 2-4 Unit FHA will get you in the home for the least out of pocket.If you have served and are eligible for a VA loan, they offer 100% financing for 1-4 units which is a great opportunity for current and prior servicemembers Once you have closed on the FHA and you reach 20% Equity you can refinance into a conventional to get rid rid of your mortgage insurance on average with the 3.5% down it will take about 2 years. 

of tenants cant afford to move their MH out of the park.  

Call the building or health and safety department. 

You would certainly want protection for yourself if you are hurt and out of pocket for a number of weeks or months, but not sure what options you have outside of the standard health/medical insurance for yourself.