Well, going off of the Wagenburg used in the Hussite Wars:
http://en.wikipedia.org/wiki/Wagenburg
To start with, I'd have to consider something that large (Size equiv to Elephnant?) to be a Construct. This means it has good Protection, zero Defense, lots of HP and no issues with Morale
Being Wood, it would also be Vulnerable to Fire [img]/threads/images/Graemlins/Campfire.gif[/img][img]/threads/images/Graemlins/Campfire.gif[/img][img]/threads/images/Graemlins/Campfire.gif[/img][img]/threads/images/Graemlins/Campfire.gif[/img]
It would not be Sacred, with a high Resource Cost relative to its Gold cost.
Based on historical laagering tactics, they would have a Move of 1 in the field, but would be Immobile on the battlefield.
Essentially, the Wagenburg would simply be mobile battlefield barricades, backed by a contingent of troops. Not a bad tactic for dealing with chaff-heavy armies.
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