Agreed Heavy, but if the insulation is Poly Urethane it wont absorb water. polystyrene does and it happens with freezer containers ( and any type of freezer room) because as the air is frozen and looses the water it contains( humidity), a vacuum is created drawing air from outside through any cracks and as that air gets to a cold level in the insulation the moisture condenses (dew point) and gets left behind.
https://www.trademe.co.nz/motors/tra...fcdfe52cb28606 This trademe listing is an example of a trailer mounted box body. The concept could be scaled up to what ever size would work.
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