I been going back and forth with a guy on another forum about swapping truck cabs, he is trying to tell me that GM made single cabs trucks in the old body style until 91. I though all old body style trucks after 87 were 4 doors until 91, did GM make military trucks and railroad trucks in a single cab old body style after 87? all the CUCV trucks Ive seen were 85-86s. can you guys give me accurate info so I can go back and argue with him more?