Looks fantastic Aaron. Gives me some ideas.
Absolutely Love mine... Have a 40' standard height. Put my motorcycle in the far back, and bring tractor in with loader lifted to top... run a strap from the already in place loops on top corners and shut her down for the winter... plenty of room to still put lawnmowers and other seasonal items to the opposite side and have 25' to spare behind. I recommend using it for toys with wheels as there is only 1 way in/out. all my quads, side by sides, Lawn tractor, etc. are what i use it for.
My first thought is condensation and heat. What I have seen of containers is that they are sealed. In normal/initial use one has a sealed container they open up, fill it with product, seal it back, ship product, unload, close back up and that's it.
On a farm you are in and out of it, may leave it open for days at a time. Weather patterns bring in humidity from which the contents absorb moisture. Weather changes that cause cool/cold nights and then sunny, warm/hot days, makes for.....well think of a glass of iced tea sitting on a table.....what does it do? It, being cooler than the ambient air condenses the moisture in the air and it sweats....cycle that process inside a closed container and you have a nice case of mold and mildew.
Next is heat. Steel box painted some color that absorbs the sun's rays...close it up and stick it out in the sun on a 100* day and you have an oven. Lots of things don't like to be kept in an oven.
So, if it were mine, I would build a covering for it, at least a roof, maybe just sitting on the top (let the container support it) and provide some sort of ventilation mechanism....round, rooftop, wind driven ventilators like you see on top of houses, barns and such do the trick. Add some vents down low for fresh air circulation.
Better yet would be to shield the sunny side....a trellis with a Morning Glory or Honeysuckle vine would work....keep the direct rays off the side.
Then I would ensure the dimensions prior to purchase and select a berm, mound, pad or something to ensure the container is high enough above the surrounding terrain that it won't flood.
Get that done and I think they are a great idea. They are popular around here for folks buying up old farm land (population explosion) and wanting a secure place to keep things till they get things built up and occupy the property.
What else that works is to buy two of them with a suitable space between them side by side and build a roof over them accomplishing the above and making a covered shelter between them. Have seen numerous adaptations of that around here and works fine. Later on some close in the ends, concrete the floor and have a shop to go with them.
What county? I'm in NEPA also.I looked into using a shipping container for implement storage a couple of years ago. It seemed like a great idea until the rural county where I live decided to tax anything on a property without wheels. Without farm assessment, my steel tool shed, my patio storage box, even my coal bin became fair game for added taxation.
I thought about being a smart A** and getting a used 52' trailer on wheels but the ramp to get the equipment inside would be too cumbersome.
Instead, I invested in a rack system in my existing building to take advantage of the unused space.