Hello Bruce.
Interesting possibility for a grounding connection, though I do not recall this particular fixture making contact with the steel framework of the body at all, just the plywood interior wall.
Robert.
Terminals for feeding 12-Volt to an externally located wireless set makes sense, but I wonder about the logic of going to all the trouble of disconnecting a perfectly operational wireless from it's location on the table inside to grunt it out to a penthouse? Then again, in the Army, what the Sgt wants, he usually gets!
Just a detail regarding the Onan. In addition to the 110 Volt output routed through a dedicated heavy duty armour cable to the 110-Volt plug at the right side corner of the wireless table on the front wall, it also featured a 12-Volt DC feed that served as the fixed wireless battery charging station for the vehicle. This way, the operator still had two charging sets to work with between the wireless battery sets, and the 110 feed for whatever required it.
Not sure about the fittings you mention above the outside of the rear door. Post a pic and we will have a look. The only fittings usually present back there apart from the ladder are the 34 ' Mast brackets behind the ladder, top and bottom, the door catch on the lower section of the door and the door hook on the lower wall just to the left of the rear gen box ventilation hatch that engages the catch.
Oh, and before I forget, yes, the tube mounted along the left front edge of the box holds spare A-Set whip sections, easily accessed by Herbie when he is on the roof of the truck mucking about.
David