I bought 2 x 2m x 3mm aluminium strips at Bunnings along with 19mm clear PVC tube and 4 rubber chair leg ends to use as end stoppers.
I attached the leds to the aluminium strip and slid it inside the tubing. I did two of these cause there are two awing rafters.
I had added a 12v external outlet to the van which is controlled by the 12v dimmer (see below as well)
I bought some microphone connector thingys from Prime electronics to makea double connector and voila!!

Happy days......can light up the whole camp area or dim it to seductive level

Haven't used that setting yet though

http://stores.ebay.com.au/The-Aussie-Blokes
cheers
Gary