I doubt EIFS (Exterior Insulating Finish System)aka synthetic stucco would be a direction to go in.
It has to be installed properly, we had multiple buildings which used it and you could tell within 2-3 years the ones that had the "cheap labor" install.
I'm not sure it would stand up to the rigors of a trailer, unless it was permantly parked. Most fiberglass clad trailers are similar in concept to an EIFS structure in that it is a form of styro foam made strong with a substrate layer and then finished. Like a camper that has foam, then luan covered with a think fiberglass like cover.
As the outer layer is part of the entire structure, I don't see many other options. If you had a stick built with the aluminum siding, you could probably do what ever your wallet could handle.
Just my $.02 worth, wish I could add $.20 tax like the gov.
