Lauren, good to see you are beginning to camp in your teardrop. Expanding on what others have said replacing the shackle straps with longer ones might be a quick, easy, and inexpensive way to reduce or eliminate the tires hitting the fenders. etrailer.com has shackle straps (links) from 2" TO 3.5" long. If that is not enough you might replace the hangers with tallers ones, too...which would require welding new taller ones onto your trailer frame.
Doing one, or both, of these modifications possibly could eliminate a need to raise the fenders. It might eliminate the need for a bump stop too. They seem like "low hanging fruit" solutions to consider (first) that would not disfigure the wooden sides of your beautiful teardrop trailer.