|
sides and top are pretty conservative at 14 degrees. Consider as much as 20 degrees.
Bottom of the carrier I would not go steeper then 10 degrees - dirty air under the car won't flow well along the bottom.
At the very back of the carrier, turn the edges in like the back of the car is - don't just chop them.
The longer you are willing to make the carrier, the more gains you will see. And even the 3 feet you mention can be a BIG part of changing the surface area on the back of the truck.
This is Another project I'm going to be building in the next few weeks for my Suburban.
I think 30 percent is pretty conservative gain - 50 percent I think is possible.
|