Got a Simpson sider helmet on the way. Haven't quite decided on the belts yet. Gonna do something with doors but haven't decided on that yet either. I may wait until I figure out how I am going to do the cage. Not sure yet. As for you AZcat, you should stick to what you know best, which is hauling your mutt in parades on pavement in a straight line at a slow speed. That way you know you won't break anything and you won't have any worries about about flipping over!
