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Hi my name is Robert......
You are probably looking at 25-30K US dollars to install a slide, if even possible, it is a big task to do this and I would find a RV shop in your area that is willing to tackle this project. They would need to work with Winnebago for prints and this type of job is costly, there are a few aftermarket places that sell kits in the US click HERE for one of them, I might send them an email tell them what you are thinking about doing and they can give you cost on the kit, that of course would not include the labor which is going to be extensive... Hope this helps... Robert