It all depends on how much someone likes the layout and its level of craftsmanship.
Building new is almost always easier in the long run than adapting a layout built without moving in mind when it was planned. This will hurt any attempt to find a home for what's on your trailer.
If it doesn't have the features that someone really wants on a layout, they won't be happy in the long run and would be better to start fresh. Anyway, the old layout could be a good source of lumber that you could recycle.
Jim