Also did the same with both front and rear TV's. You can go a step further and trim the opening with matching wood. I put in an L shaped retainer under the front TV using a sliding bracket that allows me to secure the TV when traveling. Probably overkill, but gives me peace of mind that the movable mount won't swing out while we are on the road.
Good idea to have an extra set of hands when removing the front TV. They are heavy and a little hard to handle given the size.
Not a hard project, go for it!