If anything like mine - then side storage is risky as the damm thing has a mind of its own and will crash over as and when it feels like. This, in turn, traumatises the dog, which sneaks past the upright RTT glaring ominously and aggressively at the big white thunder that will strike for no apparent reason. Of course, the floor is tiled, and there is any number of obstacles awaiting a wheel spinning dog.....