From the bottom up - the hooks are to hold a canvas bag designed to hold the side curtains when not in use.
The missing decals (zinc plates on earlier vehicles) are: Lower one is the gearshift instruction and capacities of engine, cooling system, that sort of thing, then the square one above that is a warning about not using the front axle unless necessary for traction. The one above that was a location sometimes used for the vehicle ID with chassis type and build date, contract. This was sometimes located on top of the dashboard.
On the driver side - the one to the front of the vehicle is a warning about proper lubrication of the vehicle and the one at the rear is only for winch equipped trucks warning about running the winch cable under tension.