The reason why we went with the door hinge design was for mis alignment issues. We all know that every 40 is not straight no matter how clean it is. After 30 years of road abuse sheet metal is going to tweak. Using the door hinge allows for the most adjustment, so if one side is a 1/8" off then you can make up for that.
Very good point. I would think with a pin design you could still have an adjustment point although I fully understand this would add more cost to the final product.


