there are some cool new inventions that I haven't seen at SEMA... this is a remote controlled sun shade that mounts to the roof rack rails

I kid you not, if these come down to where I can afford one, someday, I'll get one. Keeping the sun out of, and off of, the cab keeps the temp down inside your car by 30 or 40 degrees I've found from using a reflective car cover that only gets the cab covered down to the beltline. I've posted about it https://justacarguy.blogspot.com/2018/09/i-am-very-very-happy-with-this-heat.html