I am really set on getting the weber e315 with closed cart because we currently have 2 dogs who love to get into the grease. But i hear reports of rust inside the cabinet. We live in wisconsin and the grill will always be covered. I looked at the open cart vs closed in the store and both are made out of the same metal and thickness. The main reason for the cart is so we can store grates, griddle etc that may have grease on away from the dogs and it's out of sight to look nicer.i did notice on the new carts they are not fully enclosed like the old ones when the tank was inside. The left side has any a 4-6" opening below the box on left side. Don't know about the right. Also, is it possibly some of the rust was from tank stored inside and it frosting up? Any thoughts are appreciated.