Probably an inverter of some kind but I'm sure @Dellmassive can point you in the right direction for anything that uses a wire. 
hi @Rhyswxm ( thank you @Howzat for the mention )
" what else is need to be able to have a 3 pin socket and some ubs in the back of the van?" - this will depend on what you plan to plug into the 3pin 240vac socket.
USB outlets are normally 12v, so see more on fitting them here:
+++
3pin sockets for mains are more involved, do plan on Hooking up/EHU when parked up onsite . . ?
or did you want 240v power when off grid and mobile . . ?
if its mobile, then you need an inverter as mentioned above.
you can pull 100w/150w via an inverter form the 12v socket upfront for small 240v items like smaller chargers and say a laptop charger.
anything larger, over 150W, like 300w/500w/1000w etc need to be hard wired.
as a reugh calculation, every 100W will draw 10A from the 12v side.
so a 1000W inverter will need 100A or more on a full load . . . . so think carfully what you plan to plug into the 3pin.
+++
have a look at some small inverters here:
www.t6forum.com
.
" what else is need to be able to have a 3 pin socket and some ubs in the back of the van?" - this will depend on what you plan to plug into the 3pin 240vac socket.
USB outlets are normally 12v, so see more on fitting them here:
12v Feeds:- Ignition Live Under Passenger Seat -- How It's Done --
- Installing 12v Sockets -- How It's Done --
- 12v Ignition Feed + 5xusb Charging From Ign Feed -- How I Done It --
- 12v Aux Feed + 5xusb Charging From Aux Battery -- How I Done It --
+++
3pin sockets for mains are more involved, do plan on Hooking up/EHU when parked up onsite . . ?
or did you want 240v power when off grid and mobile . . ?
if its mobile, then you need an inverter as mentioned above.
you can pull 100w/150w via an inverter form the 12v socket upfront for small 240v items like smaller chargers and say a laptop charger.
anything larger, over 150W, like 300w/500w/1000w etc need to be hard wired.
as a reugh calculation, every 100W will draw 10A from the 12v side.
so a 1000W inverter will need 100A or more on a full load . . . . so think carfully what you plan to plug into the 3pin.
+++
have a look at some small inverters here:
Fridges & Cold Beer -- How I Done It --
Fridges & Cold Beer -- How I Done It -- For Most Beer Lovers, Cold Beer is a Must. (especially Larger) and for Her-Indoors a cold wine or G&T will always help smooth the situation . . . . maybe even Cold POP for the kids (My nanas term) Then there is the necessities of camping and Fridges...
.
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