Goose. It's a goose not a duck! :B:W:B
You have such much room where the decal is it would look lopsided if you took it all off or took too much off.
I'm a graphic artist and If I was behind you I'd be wondering what WAS in that gaping open spot to the right of the name the owner didn't like and took off!
My vote is to lop
JUST the head off.
Then it looks like a normal swirly RV decal. Fills the empty area in a balanced way, and the left over wings match the other graphics that are wrapping around the sides.
If you didn't tell anyone no one would ever think it was once a bird if you go that route.