I have to agree with Mike. Most of this stuff isn't rocket science and if you are at all handy and have some common sense most mods and repairs are fairly simple and probably just as easy to do them yourself. As far as the warranty, I don't understand why a screw drilled into your rv by a service tech is any different than the one you install.
I am sure installation instructions are included or at least available at the manufacturers website. Check with CrossRoads about the warranty, they will know.