It seems to me that the main concern in Hawaii for vehicles and even containers – if we disregard security – is avoidance of direct sunlight and direct rain. I have an old-as-the-hills pipe structure I park my truck under and it suffices – but I went out a few days ago and looked, and it's almost completely rusted through. It will collapse bumbye.
Therefore I decided to rebuild it. There are two types of angle fittings – the grey ones with curved angles Which is what my 'garage is made of), and the gold ones with sharp angles. I found someone with a lot of them, many new, and I grabbed them – BOTH KINDS. So now I have enough of them to build a bunch of 'standard' vehicle covers, sans the metal pipes. I am going to use Schedule 40 PVC instead, and reinforce the stress points – or even use double components for strength because metal is simply too expensive.
The point is that I have a few too many for my own use. These fittings go for $12-$15 each at HPM plus tax (Home Depot doesn't carry them) and it takes 12 of them for a structure ~30 feet long – but you can make double-wides or any length you want. And, of course, you can make them large enough to cover two stacked containers. I even have bolt-on pipe holders for catchment tanks so you can anchor your circus tent and use PVC instead of metal to keep your UV covers out of the water – which you want to do unless you like drinking bird poop. 🙂
Bottom line: $65 for twelve, pick-of-the-litter, including screws. That makes the same structure I have over my truck, but poles, cover and ball bungee cords are not included. This is just the hardware. I'm making about five bucks on the deal – not enough to discount them any more.
The offer is good 'till it ain't.