I had no problem with mine for a month but it was in the winter time they close up very tightly and handled big storms. I would consult with U-Haul about condensation from 100 degree Heat but may not be an issue. They do store them indoors at U-Haul if that's what you need also?? That's where mine is right now
i would say, not a Good Idea during the Summer Months...which start in Mid May of 90-100" weather
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