When folded for travel is 18×27-3/4 inches.
When open in standard mode, from the Axis Dolly’s center point it is 19-5/8 inches to the center point of the casters, 21-5/8 inches to the outer most point of the legs, and 17 inches to the outermost point of the inside of the spreader cups.
When open in wide mode, dimensions increase 2 inches. From the Axis Dolly’s center point it is 21-5/8 inches to the center point of the casters, 23-5/8 inches to the outer most point of the legs, and 19 inches to the outermost point of the inside of the spreader cups.
The Axis Dolly in mini mode:
Sitting dimensions are 18×16-1/8 inches.
From center point to caster center is 8-1/8 inches, and to outer most edge of body is 10-1/8 inches.
From center point of any caster to center point of any caster is 14 inches.
It keeps the camera closer to the rolling surface than a tripod head.
It keeps the center of gravity of the camera over the center of the dolly when tilted for increased stability
The advantages of a fluid head over the tilt plate are:
You can pan and tilt the camera while filming
You probably already own one that will work with the dolly