I bought an F250 SD XL model about two months ago. I pull a landscape trailer (6 1/2 X 12, single axle) with mowers, blowers, etc. I am troubled by the lack of vision from the right side rear view mirror. The mirror is not convex, so the field of vision is not very large. When backing my trailer into driveways, or other tight places, I cannot see the trailer wheels when I have some angle between the pickup and trailer. I've not been successful in buying a "moon" type, convex mirror to attach to the existing mirror. I know that such mirrors are made for larger rear view mirrors (Western style, vertical mirrors), but I've seen nothing for the simpler mirrors on this pickup. My mirror has a single point of connection to the door hinge post. I think that perhaps the XLT model may have a double arm, perhaps supporting a larger mirror. Remember my pickup is an XL model (yea - I wanted a simple work truck!). Thanks for any leads.