> A tiny minority of Americans are so often at a home supply store that choosing a pickup over a trailer would make any sense.
Your scenario here makes even less sense because most cars do not come with a trailer hitch (trucks on other hand...), you're buying another thing (which lowers that this is supposed to be an "affordable" EV), you have to renew registration for the trailer, and have a place on top of your vehicle to store it.
A truck bed is nice to have sometimes. You can quickly throw things in it (like plywood, a new large flat screen, bicycles, fishing gear, a dead deer, etc). You don't have to hookup a trailer or fiddle with wiggling things between doors and so forth.
Gain, people do not buy cars they need. They specifically buy cars for situations they will never find themselves in.