> I am pretty sure that if you need an inexpensive car with a decent charging bed, you are better of buying a regular passenger car and tow a small trailer when you need it.
Or a minivan. Or an actual van.
Truck's sole advantage is open bed. That is needed even rarer than "enough space for some plywood at the back"
You can easily fit 8 full sheets of plywood (4ftx8ft) in a 2020 Honda Odyssey, with the seats still in the car. And you don't have to worry about them getting wet on the drive back home.
True, not everyone goes camping or does their own hauling, repairing, etc.