Who cares if you have to leave a little in the deal instead a 100% BRRR.

I have zero experience with this but how would you deal with electric and other utilities? 

I have a deal in my hands of 7 mobile homes all on separate .25 acre lots and all rented out to long term tenants.

I'm new to doing owner financing deals.

It's not something you need but some wholesalers do one to provide to buyers when promoting the deal. 

When he does move I am sure you will have some yard work etc to deal with but if he stays a long time then its the cost of doing business I guess. 

How did you find this deal and how did you negotiate it?

Some of the usual reasons why people would sell to these companies: If there is money owed on the house, the house is in terrible shape, you don't feel like dealing with selling it, or you don't want to pay realtor commissions.

What has everyone been doing to deal with this reality?

We do have our account reconciliations audited by a 3rd party quarterly, which helps catch errors before they impact our clients.Highly recommend any owner dealing with a PMC discuss with their PMC and their tax professional, or an expert like @Sean O'Keefe, about how to improve processes and communications to make this process smoother:)