> Remember while you are parking your car in said parking spots you are also baking the insides so in weather above say 55F, it will get quite hot and probably need to turn on the HVAC systems to cool the cabin and/or battery periodically.. wiping out some of your solar charging gains.

Only if you are choosing to park in the sun instead of parking in covered parking. That's almost never a choice your can actually make.

The real utility of solar panels would be for driving in areas that don't have utilities (places to charge) near enough to charge from. Though, in that case, it still makes more sense to carry separate panels folded in storage than to integrate them into the roof.