If you need a means to use your mains powered equipment whilst out in the car then the 12 V to 240 V power inverter is the answer. This portable power source will happily run equipment such as mobile phone chargers, laptop computers, camcorders, AV equipment, PC printers, small TVs, portable work lights and small power tools etc.
This has only been used on 2-3 occasions, the box is a little scruffy.