POwer adaptor to power laptop and LCD monitor

[blackboab]

I have a laptop with no screen connected to an LCD monitor which I
want to use in a caravan.

I would like an adaptor which has a dual output to power both the LCD
Monitor and the laptop from the
one input socket (DC or AC it doesnt matter).

I saw one on ebay a few weeks ago but i havent been able to find it
since.

can anyone help me remember what its called ?