This is 5 mobile homes and one building being remodeled as a storage unit. 4 park owned homes and 1 tenant owned home.

Given they are going to damage the walls while moving anyway it eliminates their need to touch up the halls and I can usually schedule to have one painter knock out multiple units in a day but even if its a one off sale, it comes across as good service for a small amount of money.In a storage area within the house or garage I will leave an unopened box of each tile, and flooring used in the house along with unopened 1 gallon buckets of the wall and semi gloss paints and one of each door hardware (kitchen and interior doorway.

You say things like "It was understood that I would continue to utilize the garage and one room for storage as I transitioned to living out of state."

If I were in your shoes, I’d look into leveraging equity in your existing properties or your primary residence.

Can I charge them fees & rent for storage of their crap? 

I just want to explain my circumstances and see how people with experience and knowledge in real estate would move forward if they were in my shoes.

I’ve focused mainly on Florida but have also looked at options in Sacramento and other slightly more remote locations in CA.While I’m familiar with value-add strategies (ADUs, renovations or storage rentals), these seem like heavy lifts for modest gains.

Vanessa,I second others comment on the advice of putting yourself in the owner's shoes and figuring out your selling points from that point of view. 

The rental is currently cash negative and our thought is by converting the unused storage unit it would bring cash flow into the positive.

Seller used one of the units for storage.