Keep in mind, Chrysler Corporation had just done the FWD L car based Rampage/Scamp. They were mildly successful, as the car-based pickup market had shrunk and Rampage sold at about 50% of El Camino volume.
Beefing up Rampage to the K car platform and using the minivan rear suspension design would probably have made it a bit tougher.
And separately Jeep was taking a unibody SUV and making a pickup from it, though RWD based.
Chrysler also flirted with a PT pickup, it would have been interesting to see how it sold.
I had a little Rampage. I was amazed at what it could haul, though a full load of mulch meant a slow climb up the hill on the way home.