[ChevLoRay]

If it were mine to do, I'd just maintain the same gable pitch and extend it properly, so you could cover the whole truck. What do you have for a roof surface, now? I'd just keep that same train of thought and make it match. I agree that the opaque roof lets in some heat, as well as light, so that is something to think about, but you could use a couple of panels in the center, length-wise, to do some illumination.

So, what is Madison close to? My oldest daughter lives in Zephyrhills. I can't say for sure, but it seems I have seen the sign for Madison, on one of my visits. We've never been further south than Orlando, but we've been from west to east (Daytona), and down the west and east coastlines to/from Tampa/Orlando.