As @Aaron Mazzrillo mentioned, The challenge tends to be in dealing with sewer electric and zoning etc. tiny houses generally fall under RV laws, and in most communities it isn't technically legal to have someone live in an RV in your back yard. 

They tend to be very grateful for the home, but you do have to screen carefully.

I did this all in  less than 3 weeks for under $5000, soups to nuts.

I personally want to try to calculate what they will walk away with so I can give my best offer up front (so I can waive my inspection contingency) and beat my competitors who just want it under contract so they can go nuts on the inspection. 

Many co-ops in New York tend to have rules that are restrictive, sometimes governing whether you can rent the unit out at all.

People, us included, tend to under-estimate repair and maintenance costs of these things so the condition wasn't a problem for the buyer if the terms are right for them.

I fit in easier and older buyers tend to have cash.Besides past due rent, some parks have exterior requirements upon sale, for homes staying in the park. i.e. new deck, fencing, other upgrades.

Agents can spin or omit crucial details in order to get paidI hold an open house on weekend or whenever is convenient for me and give prospects a 4 hour window to see property.I find when tenants see competition you tend to get property rented fairly quickly.Little things like prospects calling, emailing, signing contacts, sending deposits, when they say they will can give you a pretty good indication of the kind of tenant they will be, and if you combine their integrity/actions with the things I mentioned in earlier post you should be good to go. 

The heading has your name all the way to the right of the page and your other contact info[on the next line down] all the way to the left) you tend to wonder if they are as careless with their rehab work.

"large yard", "pets allowed", "XYZ school district" (if it's a good school district)People also tend to like when all the bedrooms are all on the same floor, something that college kids sharing a house, for example, wouldn't care much about.Be careful not to say things like "safe area" (that's not your place to say) or "close to elementary school" (could be considered steering)