Ideally you could create a pool to begin with (maybe even just use the existing pool of tenants) and compare against that for each new vacancy, rather than comparing against the new sample.Also...it is probably too complicated for most people to actually emulate. 

@John O'Keeffe Welcome to the community sir.Quite honestly, you have already found THE BEST source of information right here on BP.Sure, there are other sits and Youtube channels that offer some education, BUT by far BP has the most densely pack information in all of the internets ( 'Murica)Good luck!

Ideally, you'll want to negotiate all the salient terms of an agreement via informal communication and letters of intent, then bring your attorney in to draft the documentation. 

The internet is not where folks should be getting their legal advice. :) 

BUT before you do, here's a good question for you to answer: IS YOUR MARKET AN IDEAL FLIPPING MARKET?

With the internet you pretty much have full acsess to the MLS.

@Matt Cramer  Without knowing the fine details I can only give you some basic input...The trailer will depreciate in value, but ideally the lot will of course appreciate, so the value I imagine is in the land. 

You'll want to make sure you have MLS access (realtor.com or via a local realtor -- ideally both) as zillow's MLS info is often innacurate or outdated.Also check the REO sites directly (auction.com, hubzu, homepath, hudhomsetore, hudsonandmarshall, etc) as not all of their properties end up on the MLS or zillow.

If your housekeeper has access w&d in his/her own home then that would be ideal.

I also have 3 rental houses in Las Vegas, which I purchased at the ideal time a few years ago.