what about something like roadlogistics.com.au , raillogistics.com.au , maritimelogistics.com.au ???
In domains a miss is a good as a mile. "Shipping containers" is a consumer term, the usage is simple,
http://www.portcontainerservices.com.au/
"buy a shipping container"
"hire a shipping container".
The domain is 100% "right". The product is clear, it is a simple and people are likely to buy it online or at minimum do research online and then make a phone call. It also something you can't duck down the street for, for someone who want to buy one shipping container (ie someone who isn't a major transport company) the only other likely option apart from the internet to find a supplier is likely the yellow pages.
So I'd say this is something of a niche when it comes to people buying a shipping container or modifying one (and probably a big niche too).
Something like roadlogistics.com sounds "impressive" but it is a corporate term as opposed to something someone would search for, it is the sort of term that would be used in an annual report to tart up something simple, as opposed to being customer centric. Wouldn't renew these names personally.