The V is designed as mobile computer, so there should be no unnecessary parts or cables to carry around.
A dock , usable as "homebase" for V on the desk is a great idea.
A powerbank to give some extra hours of mobile work is also great.
I would prefer a modular design of 3 parts:
1. Dock with extra "PowerDock" for powerbank (charging) and usable as stand for V. Not a solution as "dongle" or "sidebox" with cables.
2. Charger directly attachable to powerbank (charging on the road) and usable for V or dock as direct powersource.
3. Powerbank usable as mobile powersource for V.
Best would be to have this components all direct attachable without additional cables. One cable from wall-outlet to charger is everything you need with this setup.