If you don't have an agent...well...nothing is a problem until it's a problem but our advice and opinions are meaningless if you actually need to use your insurance.It's vitally important that you understand exactly what you have before you need it. 

If you added in the cash you should have to protect against contingencies, the actual return goes down (or the risk sykrockets, your choice)- If the $300K properties cashflow, definitely a better bet. 

He was happy to allow me to rent out nightly because it actually helps keep his property in better shape than a long term renter (having a cleaner in there every turnover, short stay guests always let you know when something isn't working, etc) but didn't want to hassle with worrying about a percentage of income/management, etc.

I actually am an attorney, and still send mine for extra vetting. 

Unless a MH is put on a permanent foundation on an actual privatley owned lot, the majority of mobile homes depreciate in value over time.As @Greg Scott mentioned, you can find cashflowing deals if you know HOW to look.

Flipping is actually more a business than it is investing and you know how much goes into that.

My lot is actually only 75' wide but was grandfathered into the zoning once they made the setback changes (neighborhood is late 1950 builds). 

When you do that, you can get better pricing and leaves less room for error.The best advice is to push forward as quick as possible, fail forward, and always continue to introspect on what you would do differently and then ACTUALLY go back and implement that change (easier to say than do).

It will help a lot if you understand accounting and how the statements are actually generated.

You can manage your own properties, which I think you need to do as a new investor to learn what it actually takes to run a cash flowing property.