Why when actual unit sales are available would you use days supply instead? If they taught critical thinking while you were in school you must have missed those days.
Days supply is indicative of how good a job the production scheduling people are doing in forecasting demand. The extended cab days of supply is odd in part as this truck has been termed by GM a "double cab" for the past two years.
The F-150 pickup outsells all other 1/2 ton pickups combined in actual units sold. The Ram 2500/3500 trucks outsell Ford and GM/Chevy combined, even with the F-450 pickup version thrown in to boost up Ford's sales numbers (which is why Ford makes two very different F-450 trucks).
It takes a fool to follow the mob mentality and think that because more people buy something that it is better. With this logic McDonald's must make the best hamburgers and Starbuck's must have the best coffee.