Look at this post from Thor (Facebook):
(If you don't have/don't want facebook, this is what it says:
For 2019 model year, the Palazzo, Aria, Venetian and Tuscany all lead the way towards increased sustainability with the addition of solar charging. Less dependence on fossil fuels helps Thor Motor Coach lead the way towards "greener" camping!
Interesting (and on the Vegas video I posted earlier it now comes with a solar controller...just add the panels)...