Sure thing, I would like a
12v system with battery under passenger front single seat.
down led lights x 4 on 2 circuits, nice warm colour light
2 12v sockets
4 usb sockets on 2 outlets, option for (higher output to charge iPad and larger devices)
option to power a the pump for a webasto style night heater further down the line.
240 mains hook up under the bonnet
with an inverter and 2 13amp sockets
I thinks that covers most things.
Cheers Tom