I finally got around to upgrading my Gerber Dolly to servo-motor drive. Now officlally as fast as the MRMC Bolt robot rig...
In this configuration to is optimised for running a tripod with pan tilt head, and will carry any camera up to a full size Arri Alexa.
I will also fit a crane arm, though performance may be a little slower, due to extra weight and safety precautions...

Password "Bolt"
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