This is my version of a diy pocket dolly, driven by an adjustable 12V gear motor. The power comes from 8 AA rechargeable batteries, which are integrated into the controller. The dolly is pretty light and compact so that it fits in a backpack and I can take it with me on walks and on holiday trips.
Nikon D90, Sigma 10-20, Nikkor 50 1.8, Sigma 105 2.8 __________________________________________________________________
A few more detailed informations: