The tank is poorly balanced and has a tendency to tip over. If it fails a Mob check that involves steep surfaces or uneven ground, it capsizes and becomes immobilized. The tank remains immobile until another tank or tanks right it by succeeding in a Str check (TN target Size score).
Multiple tanks may pool their Str scores for this check, but the capsized tank may not contribute. The total number of successes required is equal to the capsized tank’s Top-Heavy rating.