Steve, the Dodge Magnum was a wagon (that a giant sat on, squashing the body down toward the rear).
I find that my Dodge Dakota has excellent rear visibility. But that’s because I don’t have a cap on it.
To the OP: Stick with sedans (unless you WANT a pick-up truck!), and start spending time in the driver’s seats. That’s the only way to see what fits your particular body best. You might also want to consider adding oversize or convex mirrors to your current vehicle.