As for small 2x4 pickups, you might add Mazda B2000 to the list.
Is it the low slung seats in the cars that are the back killers, or the too small door openings?
FWIW 91-96 Ford Escorts (sedan, hatchback & station wagon) have a reasonably tall roof line = not necessary for me (5' 11) to hunch over during entry/egress. MPG is considerably better than any of those small pickups.
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