Seems a shortsighted act by someone with zero knowledge of the consequences of their actions.
In the short term you won’t see any failures, so they will be vindicated, then a few years down the line with elevated levels of corrosion and physical stress everything will be of exceptionally poor performance and unreliable. By then whoever took the decision will probably be gone and be none the wiser, but you (or whoever follows on from you) will have to fork out for new gear way before you really should have done.
Much touring gear and club gear gets this level of abuse, but it is earning revenue that covers its replacement on a far shorter lifecycle than installed gear. Abuse is heavily factored into the business model of rental gear, and the rental costs reflect that.
In effect, with all that gear you are throwing tens of thousands down the drain in the long term to save a few thousand on a safe storage unit in the short term.
Anywhere that condensation can accumulate will be exposed to massive expansion forces if it freezes, enough forces that could (and often does) split an engine block on a car.
Anywhere you have dissimilar metals in the presence of moisture you will get a galvanic reaction that corrodes those metals so many connectors and contacts can suffer corrosion that is accelerated.
There are a whole host of issues with storing gear in trailers. I know them very well I just bought a sound system that spent 10 years in trailers and I have spent thousands of hours recovering it.
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