The question is mostly a personal financial planning question and it depends on your preference and what balance of risk and access you'd like and would be comfortable with.

For mobile homes, it often depends on whether the property is considered real estate (attached to land) or personal property (if it’s not).

It will likely depend on where you are looking. 

Depends on the item but I usually use Amazon and Costco for those kinds of items.

In my experience, 75% of the time, the tax payer doesn't have a large enough liability to justify the accelerated depreciation anyhow- depending on your income and tax bill, it might not matter at all.

With $50K and a DSCR loan, your budget will likely cap at properties in the $150K-$170K range, depending on the closing costs and any repairs needed.

This also depends on how are you calculate cash flow and what you're using to discount for expenses.

As a long-term hold investor, I see this property as -$600/mo to -$800/mo depending on whether you use a PM or not.

It will be highly dependent on the district and licensing.

Handle Legalities:Make sure you have all the permits required for the task you intend to perform.