It took a while to figure out where to place the charger, eventually the small storage in the tailgate was the best fit. This way the radios are also out of sight when the car is locked, it's not an expensive set but could be convincing enough for someone to break open a window for it.
The charger unit is 7.5 VDC so I needed a DC/DC converter, again a cheap option was at hand by using a plug-in cigarette DC/DC type. The unit was stripped and the input and output cables were attached directly to the PCB.
The power is sourced from the central cigarette lighter, a cable was added and routed beneath the carpet along existing wires the the back of the vehicle. Here the DC/DC converter is attached behind the bodywork and all cables are labelled. The charger base is fixed with screws to the base of the tailgate inner plastic. Some Velcro straps are attached to the charger to secure the radios while in the charger.
We have been using this setup numerous times since installed, pretty cool to always have fully powered radios at hand! The maximum range is about 3 to 5 kilometres, which is good enough most of the time.