By investing, you can create multiple income streams that not only cover unexpected expenses but also give you a sense of control and empowerment over your financial situation.

Find out if you're required by the local code to have a medicine cabinet before you take it out.

Research local market rates to determine how much more you can charge; often, Airbnb properties can command 20-50% higher than traditional leases, but this varies by location and demand.

The home is fully surrounded by woods—no neighbors in sight; so views are important.  

My question is do I run the numbers on the SFH as if it were by it self, then run the numbers on the trailers in park and take the average of the 2 cap rates? 

Those are being reassessed every year by the county.

We like self-storage because even if there is a recession, and people downsize, those people will have a need for self-storage, as evidenced by storage occupancy rates during past recessions.

It's best practice to remove them, spruce the place up, and put in new tenants at market rate that have been screened and approved by you.

Correct, generally once you receive a good estimate by doing recent sale comparisons in the area of your existing property.

By harder, I mean finding deals that actually pencil to even modest positive cash flow returns.