RE: Portable Charging Case
Yes, there are lots of options.
I used a Stanley "Fat Max" toolbox and made a shelf for the chargers from a plywood/particle board sandwich, covered with white Ultracote. The PS is a Meanwell 24v/42A and the exhaust fan is from Radio Shack.
Various battery adapters and cords are kept in the plastic box that fits in the shelf area for transport.