Highlighting the WAM-V in Gazebo Sim shows a very large rectangle around the entity:  Zooming in to the far end of the box reveals the reason is that the wam-v base link is located on the other side of the arena: 
Highlighting the WAM-V in Gazebo Sim shows a very large rectangle around the entity:
Zooming in to the far end of the box reveals the reason is that the wam-v base link is located on the other side of the arena: