I bought a wrecked camper for parts on my build which included a slide out. I found out it was made by Norco and I am very happy with it. I ended up disassembling the hole thing as I wasn't impressed with the room assembly itself but the mechanism part works very well and I am very happy with it so far. I believe this is going to be the most cost effective and least destructive to an already built camper to install in a new or already built unit. Here is a link to one of their flyers:
http://www.primetimerv.com/download/...yNorco-FAQ.pdf
If you look at pages 5 and 6 of my thread you can see how it works. I haven't ordered the 2nd one yet but when I do I will let you know the cost:
http://www.truckconversion.net/forum...58/index5.html