In that era, trucks were strictly work vehicles, unlike the urban cowboy status symbols of today. They didn't have bright work or any luxury amenities. The coupe was more of a vehicle that you could take to church on Sunday in your nice clothes.
I am 5 10, 160, my long legs get stuck between the door and steering wheel in the PU when I put my foot on the clutch (for sure 30-31 not sure about 29-29). I like the looks of the coupes so that that would be my vote.
On the subject of PU's, does anyone else use the term "cracker box cab" for the 28-29's?