Storing car in shipping container

I've been in the Army now for 14 years, the military LIVES out connexes aka shipping containers. Never seen one that had any condensation issues. Usually is leaks from damage or rust. Look for one that has good seals, no rust damage, look for solid metal floors if you find one with them, the wood ones let alot of moisture in. One thing though, you know that musty, army gear smell you smell if you ever buy used army gear or go to a surplus store? thats partially where that smell comes from.