They won't catch on at the price quoted but as technology improves and the panels become more flexible and prices come down they will be a standard feature. Our new Alto TT has solar panels glued to the roof and they follow the curve of the roof so the TT is more aerodynamic. The AC is a heat pump under the front seat to nothing on the roof , again, better airflow. TT's are changing all the time and items that were very expensive options are becoming affordable.