For those of you like myself who do NOT like to walk, shuffle or sashay while operating camera on a particularly deliberate and repeatable move, the Matthews Doorway Dolly is a terrific solution. This particular is a "round-D-round", enabling it to operate in a uniform turn while keeping the center consistent to the focal target. And it is rated to carry up to 1100lbs of gear and operator(s), in case you and you AC have been spending too much time at the craft service table... ;) I also have 20' of Matthews Strait Track, a Matthews Cinepede and crate of Track Wedges available as a separate rental.