Little Red Wagon
A miniature version of a normal wooden wagon, that has been painted red, but this wagon is magically enchanted to carry any weight that can fit on it. The wagon is impervious to any damage that would be caused by anything over weight. The wagon can still be damaged by normal attacks, fire, and attempts at breaking it. The wagon is able to hold any amount sized load that can be placed on it. Any oversized load can still be imbalanced and every turn that any character is dragging the cart they should roll a d20. On a roll of a 20, subtract one for every foot over the operator’s head, the pile will lose a loose piece. If the pile should be below the user’s head then no roll should be necessary, unless the DM deems it so.