I never had a problem with the carpet moving in my truck after installing deadener, though after I put back down the felt stuff, seats, and trim I don't think that could ever be a problem. The layer of ensolite(which is very easy to use and install), is kind of tacky, so even a loose area of carpet would stay put. The RAMMat is very easy to use. It is super soft and pliable....only the back side of a screwdriver for the tight bumps is needed, and NO cuts. I did use the glue Rick provides, and I highly recommend that stuff. I do have alot of hours into this job, but the door access covers took some time...the actuall install of the material isn't bad at all. I suppose around $450.....