That means being on the phone, a lot.

I have better luck with post cards with bright colors, easy to see phone numbers and that specifically name the property you are interested in.

Now you have a bit of a baseline to compare other potential deals too.Now if you see a "we buy houses" sign with a name or phone number you don't recognize you can simply call and ask to be added to their buyers list. 

I swapped the sign for a hand written "Se alquila" (for rent in Spanish) written in Sharpie, and my phone rang off the hook non-stop.

I swapped the sign for a hand written "Se alquila" (for rent in Spanish) written in Sharpie, and my phone rang off the hook non-stop.

Word of mouth, the original mobile home in the photos was not on the market.

Word of mouth, the original mobile home in the photos was not on the market.

Word of mouth, the original mobile home in the photos was not on the market.

Set up a reminder on your phone to call the institutions/each contact on your list every 3-45 days regularly. 

A few phone calls and trips to see the other MHPs in your area will tell you quickly what the market lot rent should be.