Professional Equipment Sale (1x) Porta-Jib Three Legged Spider Dolly (2x) Porta-Jib 40' FlexTrack Dolly Track (1x) Bogen/Manfrotto 3182 Professional Aluminum Video Tripod Legs with Leveling Base, 2-Section, 37-58" (1x) Bogen / Manfrotto 3285 Hard Case Market price $2500 This versatile design can be configured as a 3- or 4-Leg Dolly. Purchasers of the 3-Leg Spider Dolly can later add components to their kit to upgrade to the rideable 4-Leg Spider Dolly. Owners of the 4-Leg Spider Dolly can configure the dolly for use as a 3-Leg Spider Dolly. The components of either Dolly can also be used as a Mini Trolley. Combined with FlexTrak, the simple 3-Leg Spider Dolly converts your tripod into an inexpensive, extremely portable, tracking camera dolly. Add a fourth leg and you can further accessorize it to be a fully rideable 4-Leg Spider Dolly with adjustable center column, a seat that pivots 360 degrees around the column, foot platforms and pushbar. The Spider Dolly can work on their award winning FlexTrak - a flexible track made of special steel-reinforced tubing that not only rolls up into a bundle for easy transport, but also allows you to make straight or curved dolly moves with almost no set-up time.