Me, too -- I'd be interested in purchasing such an option.
I've also started to think about fabricating one myself. Do you know if there are good drawings (ideally
CAD files) of the exterior roof surface available? I've looked around on the Ford Commercial Trucks
web site and haven't found anything.
With CAD models in hand it would be relatively easy to design some molds and a few machined parts
for a cap.
Thanks!
Kwin