The standard sizes of RV garage doors are 16 x 8 feet. But since not all recreational vehicles have the same size, you might have to order a custom made door to meet your requirements. Some RVs are extra tall and thus the standard headroom won’t be enough. Always remember that such large vehicles are never flexible. If they hardly fit to go through the opening and there is a landscape slope, you might have a hard time driving in or out. In this case, the available RV garage door sizes might not be right for you.