The only way that I would even consider attempting to poer the Van via an inverter would be if you have a 100% fail safe way of disconnecting the Vans own charging system before connecting the inverter.
That said the cables required to supply the 12V from the battery to a 2000w inverter will be not far off the thickness of a pair of car jump leads so really your replacing one set of leads (your extension lead) with anohter set and then giving your battery a hell of a beating as it tries to run the inverter.
A good leisure battery has 110A of capacity not all of which you can use because of voltage drop and thats when it is new. Inverters of this sort of size normally need 20A at least so your battery only has a few hours before it is completely empty.
The easy option is a 12v TV or rather than all of this if you want to have the TV at the other end of the van then either fit another 240V outlet there or have it fitted for you.
This will be so much more useful for other things as well as being cheaper in the long run that the inverter, cables and other bits.
If you really want to run the van from an inverter the simple answer is yes it can be done but you need to be sure of what charging system you have in the van, capacity of battery and age, isolating the vans charger when the inverter is in use etc
Initially I can see where your coming from with this and not trying to say dont do it just that if it were me I wouldnt personally due to the work and everything else involved.
Best Regards
Ian
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Topic: inverters
Are you saying you want to plug into your outside EHU socket, from an inverter connected to your battery 
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