The Kislev War Wagon rules currently stand at 950 words. Here is a suggested 425-word version. I have retained the meaning but edited out unnecessary bits. I have also cut out the infantry-touching bit because, in my experience, it is not a 'good thing'. Why increase the surface area of the enemy's target with low or no armour save units? Guaranteed way to lose the combat.
War Wagon. The War Wagon consists of a wagon stand and a horse team stand. The unit must always be in either a column with the team in front of the wagon, or a laager with the horse team placed beside the wagon edge to edge.
Any movement must always finish in a wagon column. The wagon cannot charge and moves 20cm at full pace. A unit in column at the start of the move moves at full pace, a unit in laager at the start of the move moves at half pace. Terrain restrictions are the same as Artillery.
When in column an order can be given to form a laager. This can also be done by initiative if visible enemy are within 20cm. Note that a wagon cannot move and form laager with a single order - a separate order is required to form a laager. When a laager is formed, either stand pivots to face any direction and the other stand is then placed in formation alongside it. Only the wagon stand can shoot and fight. The team has '0' Attacks but either stand can be removed as a casualty. The War Wagon has 4+ Armour as long as the wagon stand remains. If the wagon stand is removed the team stand has no Armour. The wagon stand can shoot all round and can draw a line of sight from any exposed edge and even over the top of the horse team stand. The wagon has a range of 30cm. The target's armour value counts one worse than usual. The wagon is permitted to shoot over the heads of friendly troops on lower ground in the same way as other Artillery . The wagon's shots do not 'bounce'.
A laagered wagon counts as a defended unit. A wagon column counts as in the open. A laagered wagon has no sides or rear. A laagered wagon cannot be driven back or routed by shooting. But roll for (defended) drive backs to see if it becomes confused. For Gerroff, roll the dice as normal and if it would normally have left the table then roll 1 D6 and it is confused on a 6. A wagon column cannot pursue and it is destroyed if forced to retreat. Although it is an artillery unit, a wagon laager will neither pursue nor retreat but is not destroyed if forced to retreat. It also continues to count as defended in subsequent rounds. The enemy can continue to fight by 'pursuing', but there are no pursuit bonuses.
Any Kislev infantry unit with a side edge of one stand touching any edge of a laagered wagon stand counts as defended for shooting and combat. This advantage applies only in the first round of combat when charged.