Armored Personnel Carriers were a class of unit slated to appear in Battalion Wars, but never did, probably because of the more versatile Air Transport class. Both Xylvania and Western Frontier had their own APCs. The Western APC resembles the American Stryker while the Xylvanian APC resembles the German Sd. Kfz. 251.
The Western Frontier's APC is shown in this BWii concept art.
Xylvanian APC
Western Frontier APC