Good man, INFOCUSHAULER! You will find this is very effective at improving your road MPG
I can visualize what you are doing. Mine is almost exactly the same except mine is made of lumber and rubber mat.
You will need a couple of 4x8s of foam core. If you look the top of your cab is about 48” wide. You will have a main sheet then two angled filler sheets to fill in the sides.
Like me, you are using a single angle on your first try and about 17 degrees is what is comes out. 17 degrees is A-OK, but the maximum angle is 28 degrees. By doing that, you could have a flush-top shell coming to about 48” forward of the tail gate and a 6:12 slope (25 degrees) to the tailgate. This would result in more cargo space.
I like the shrink wrap idea. That stuff is much tougher than people think and you can get it much tighter at the seams than my rubber mat.
Before you do this get a baseline MPG
. At couple tankfuls at least. After you are sure the top is OK (you’ll know within a few miles) do another test. My guess is you will realize a 3-4 MPG
increase over an open bed.
Mine has proven much tougher than I thought it would be. I figured it would last six weeks but because it sheds the wind very well and there seems to be no working on the seams at all. It is still water-tight. If I do a project I have in mind this year the old prototype might be free to a good home.