I've ordered the OEM graphics from Forest River on 3 occasions.
Call Cindy(574-642-2640) in the Rockwood/Flagstaff parts dept. She's very helpful; and busy also. You may have to leave a message. She WILL return your call. She'll need your model & VIN number, so have it ready when calling.
As for the cost, they are no more than having them made locally. I've gotten prices from FR and from 4 Graphics/Sign companies and found FR to be right there with them. One think about buying from FR, I know I'm going to get the exact replacement. If your have the Graphics made locally, chances are they may be a different size.
Once removed, you'll find the fiberglass will be brighter, where the Graphics were, than the rest of the trailer. This is because the area hasn't been in direct sunlight. It will leave a Ghosting Effect where the factory Graphics were. So you may want the OEM to cover this same area.