General comment about solar power to augment charging of a high-voltage EV.
Relative to the amount of power an EV needs, solar panels will provide only a trickle. Roof-top solar panels are not actually a rational choice. More of a feel-good choice. Panels the size of a vehicle roof are...
Hi: It would seem impractical to think you might be able to "hard-wire" the DC solar output from a solar panel into the DC charging system of an EV. Perhaps someone could figure it out, but I suspect it is not simple. And might void your warranty.
Your idea of getting 12 Volt power is...
This is a good general discussion of "flat towing" behind an RV, with all 4 wheels of the TOAD (towed) vehicle on the ground. As I understand it, no current EV will allow it.
The Slate RWD EV truck has been compared to the Ford Maverick. Specifically, the hybrid FWD version of the Maverick...
A solar roof might be a feel-good add-on to the truck, particularly in the long-roof form. But there would be some added complexity to allow the solar power to actually supply or boost the huge lithium battery.
So, let's see the actual pricing of such an option, from the OEM.
Oh, I am sure...