Losmandy camera dollies are a better choice for 3 reasons:

1) Flexibility. The 3-Leg Tripod Dolly can be set up in any circular shape.
2) Floating Wheels on one of the track rails. There is no need to measure a precise separation between the track, you simply approximate a 2 foot (60cm) separation and the floating wheels move in and out to compensate for any deviation in the spacing. This makes setting up a run on FlexTrak almost instantaneous.

included is the flex track.

You will need any tripod to attach on top, baby legs for short set up or normal tripod for any other size.

The Losmandy® Spider Dolly has a versatile base that allows for additional configurations.