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Portable air-con will most likely do any good. I used one in my shed (light coloured mini-orb external cladding over fully insulated stud walls, corrugated fibreglass roof sheeting over fully insulated ceiling, concrete slab floor) and during summer the 3kw portable unit could not cope. I ended up installing an LG 2.2kw in-wall air-con and this is great. For a 20 foot container sitting in the sun, I don't know whether anything short of 15kw would do it. Passive means (shading) along with good ventilation will be your best bet.
Cheers,
Jason.
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