I have written about my tour of the Mekong and my trip up Cam Mountain in this blog: Me Kong Tour Part 1.  Because I was sitting on the back I could take a video which I have now formatted and here it is.  Downhill express

It took 18 mins to go each way and it was so steep going up that the driver and I had to sit as far forward on the seat as possible.  Downhill was a bit easier, it was one of the highlights of my time in Vietnam.