Here's what it sounds like: A tank (of some size) needs to be moved from where it is situated to a container chassis. The word "transfer" comes to mind. "Relocation" doesn't quite do it for me because it sounds as if it is being moved from Munich to Hamburg. Companies and individuals relocate. Freight and "unmovable" objects don't (very often).

There is another term that is used when placing a heavy or cumbersome load in a place from where it may be moved again. For example, when a heavy item (such as a tank or piece of machinery) is out somewhere, the truckers and millwrights call this "spotting".

As in "The tank has been spotted at the south entrance of building four." Likewise, the tank may have been spotted on the container chassis, but the term "transfer" is most likely more familiar to the general public.

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Note added at 23 mins (2008-03-24 15:24:22 GMT)
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Oops, a typo! I meant to say "put somewhere", not "out somewhere". Sorry.