Erika,
You did not say where you live but I am presuming you are in California. Salvi Harps is based in the LA area. Perhaps you could contact the manager and inquire about borrowing a harp trunk or buy/borrow/rent a shipping box to protect your harp. You could also get guidance on properly transporting your harp in a truck. When I shipped my harp, I made sure it was strapped inside the truck to prevent it from sliding around. I had a metal case for it. However, my new harp arrived in a huge cardboard box which the kids down the street turned into a fort.