Battlewagon
(Rule)Description: The Battlewagon can carry as many models as can fit or balance on the model. Any models that fall off when moving the model count as having fallen off in gameplay terms too and the normal rules apply for their damage. See Pg. 77 of the 40k Rulebook
Orks in the Battlewagon may use any weapons that they are carrying. The field of fire is based on the position of the individual Ork model within the vehicle.