I live in a double wide mobil home with the same type of walls. I have painted and papered sucessfully. On the walls instead of painting the whole wall why not try a painting technique. I sponged on my livingroom walls and it worked great. I also painted my daughter's bedroom a solid color, you just have to give it a few days to "cure" it doesn't scratch off easy then. For wall papering I just added a brush of wallpaper glue instead of just relying on the paste on the back of the paper. Stays great and removes easy too. If you have anymore questions e mail me, I have did it all to my walls and rooms of our mobil home.