85_Ranger4x4
Wallows in rivers
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The camper shell/topper has been shown to be fuel usage neutral if it's a fiberglass one. You lose the air bubble generated by the air catching the tailgate but the general air flow over the truck is better. The catch is that the added weight cancels any benefit from the better airflow. So, neutral.
Cab size and bed length/depth play a factor too.
The mid caps are a mixed bag, depending on how they are designed.
Mine appears to be designed after a F-117 Nighthawk... so I assume it is pretty crafty with the wind.
