More traditional things I would suggest, billing back utilities, charging for pets, upgraded finishes to increase rents, charging fees for things like storage or extra parking.Authors I would suggest Ken Mcelroy and Dave Lindahl.

Our insurance went to $1600 p.a. but we added it back into the rent but we had to accept exclusions for painting & any other flammable storage.

All that upgrades for storage?

Many lenders are doing periodic occupancy checks and because the property is investment / Rental, if caught committing "Occupancy Fraud" the lender can call the note due, foreclose and the owner is out like the fat kid in 5th grade dodge ball!

You should also consider self storage syndication deals.

Off market deal, existing MHP with 25 homes (12 POH) along with 27 RV lots (25 occupied) and a connected RV and boat storage lot with 50 spaces.Obviously not a pure play MHP but the financials are looking pretty compelling so far.Anyone have experience with this type of hybrid arrangement? 

You need to make sure you offer with a good amount of lease option money to the seller and be fair with your expectations or the minute they run a ridiculous scenario/ offer by their attorney or realtor, you're out like the fat kid in 5th grade dodge ball! 

I like Paperless Pipeline for my file storage system.

No wonder the USA is fat and sick.

I guaranty if you were to battle anther realtor with a borrower/ buyer who was to do as I described above, 7 out of 10 times you would lose down here in FL  with that outdated strategy of "Poor Mouthing the Offer" with ridiculous Good Faith Deposit amount in escrow.If I were selling a 500k home, and an a buyer hit me with a 5k deposit, their offer would be out like the fat kid in 5th grade dodge ball!