Len,
Just seen your post, so sorry for the delay.
I cleaned a Chenile rug, late last year. The one I did was only 6ft x 4ft. If its the same type, its more like a thick fabric than a carpet. I used a microsplitter rinsed off with water and it came up well, though it was a pain at first as the tools suction kept grabbing the thing. Ended up pinning it to the decking outside, that made it easier. As expected it did warp slightly through differential shrinkage and I think this is the biggest concern (If its the same type).
Dave.