A couple days ago I took an old carpenter's steel square, used a torch to cut off the "2 ft" side, heated and bent up one end 90 degrees, and used a grinder to sharpen the other end. It seemed to work decently, but the carpet is still stuck.
Yesterday, I make a one-hour trip to an RV dealer/service shop (I won't mention the name because I don't know if it is allowed in the forum). They spent a lot of time with me, explaining what to do and how to do it. They said that I needed to remove the "facia" around the inside of the slide. With that done, the slide should move out enough to reach the end of the carpeted area. If it still doesn't slide far enough, I will have to disconnect the slide from the mechanism (on the outside) and use my forklift to totally remove it. They also showed me how to make the fixture for the forklift. Really nice folks.
Today the fun begins.