campervan travelling with a baby

I am travelling from Melb to Karratha march 2004. we will be staying in our ACT Campervan, that has 2 double beds at each end. There will be 2 adults, 10year and a 14th mth old baby. pretty cosy.

I am wondering if anyone has ideas on setting up a cot/bed for a 14mth old baby -as a porta cot will take up too much floor space.

Any ideas on ways to turn a couch into a temporary cot every 2nd or 3rd day would be good.

Hints on travelling with a baby will also be greatly appreciated.