They're all 84's or 85's except the one with the camper top. It could be an 85GT or 86 or 87 SE. If it's an 85, it will be a V6. The 86 or 87 could be either L4 or V6. Any of the 85's that are SE's could also be V6 or L4.
The one with the 13 inch turbine wheels is definitely an 84 and it's likely the one with steel wheels is an 84. If the Interior vinyl pieces are in good condition and not warped or cracked, they can all be cleaned and dyed to go into any year. Marker lights and tail lights and Generation 1 motors are good parts to have on hand. If the 85GT is a 4-speed, that would be a good grab, and even any of the 4-cylinders that have manual transmissions. Isuzu's are suitable behind a V6.
Radiators, if they still have coolant in them, original Harrison heater cores, cooling fans, Isolator relays for the headlights. All of those things are good shelf items.