I am hoping we get a lot more posts on this thread, because I am in need of some design upgrades myself.... I don't want to be arrested by the fasion police!!! check this pattern out. we just bought our trailer in February because it was a great value and layout, exactly what we were looking at, but I am a drycamper/hunter and I don't see the couch working for me either.
I would think you could do a slip cover for your couch. Just measure it and look for it. Lots of people make them.
I am ready to change to curtains in my TT also, we have 1 broken day night shade and the rest are getting troublesome.
Have you looked at those stretchy sofa covers. Most department/discount stores carry them. Just get something in a neutral solid color and when it gets dirty you can just dryclean or wash them and put it back on. Some have separate back and cushion covers.