I eventually bought my own portable ac units in case of failure.  

He needed space for storing his rv and busses so he gets to use the portable building and space for10 busses until Aug 2020 How did you finance this deal?

apparently the tenants brought in 4 portable heaters.as an investor, i think it wise to minimize your variable expenses, and getting tenants to take responsibility is just good business practice.  

Put portable thermostats in each room and record temputure. you are only required to be within the legal limit. they   can threaten all they want. legal limit and maybe you bump it up a degree. after that tell them to invest in a portable heater.

@Andrew Korcek Every service that I’ve seen charges per applicant, including Zillow ($29): https://zillow.zendesk.com/hc/en-us/articles/360000620888-If-roommates-are-applying-do-they-need-to-submit-separate-applications-Zillow does allow the applicant to pay once and then “re-use” that application for free with other listings on Zillow (not sure if perhaps that’s what your co-worker may have been thinking of):https://zillow.zendesk.com/hc/en-us/articles/360000620868-What-does-it-mean-to-have-a-portable-or-reusable-application-

If you're trying to cut electric costs then why not go with a portable heat pump instead?

My 2nd and 3rd floor tenants has no problem and they have additional portable heater running to keep themselves warm. 

Patti if there are portable sheds and items that are YOUR PROPERTY not inside the mobile home you can take those as they are not the property of your tenant.You would have to make sure the tenant did not store anything of his inside those buildings.The reason you are getting trouble with the police is you are doing a "self-help" eviction which is against the law.When the landlords make a mistake they simply can't knock on the door and tell the tenant "I screwed up letting you rent here now get out now".Even if the tenant left a pro-bono attorney would have a field day with you for doing such things.If the tenant is doing drugs maybe you could file a report on them with the police and get them arrested.This is of course not legal advice of any kind.Trailers are a real tough business.You usually get transients and other unstable tenants that won't qualify for a regular apartment or renting a hotel by the week.You get a couple if nice folks but many are bad and trash the units.My mom's friends have been in the business of renting mobiles homes for 40 years and have about 50 or so.Just had one trashed like you are describing the other day.They buy the trailers real cheap because they know they will take a beating.Maybe the land the trailer sits on is worth a bunch of money.You could get this tenant out and sell the land and take the cash and invest in something with less of a headache.

I think I, too, will ban firepits and pools.My lease says I forbid then without my written permission, so I'll keep that enforced.A portable fire fit seems like "no big deal" to a tenant, but I see a strong gust of wind and the property burning down.

*Consider purchasing a low-cost individual E&O insurance policy of your own, which is portable and covers you for any transaction you might do.