1960 Airstream Tradewind Page 8

When we picked the Tradewind from the pasture it had been parked in we used a commercial RV tow truck. The images below detail the hitch. To show how green an Airstreamer I am I thought the first photos were of an extra that someone had placed in the Airstream, did not dawn on me that they fit into the tow vehicle. Now I know better, but the big questions remain... What model is this and can I still safely use it?

Top view, rusty but sound. Weighs about a ton!	Truck's eye view.
From Below.	Close up you can make out some raised letters.
Looking at this and the previous image I can make out the word Equalizer. How good is this unit?	Nice plastic label, all that's left.
these two bars connect into the trailer but do they connect to the piece above too? If so how.	Locking pin, only have one but I know it takes 2.
Locking pin and bars.	Curbside Tradewind hitch.
Street side Tradewind hitch	I suspect that all hitch parts are circa 1960. I need to know what the various parts on the Tradewind hitch are for, one looks like a brake failure switch, another like a place to connect a CB. I would like to extend this about 8 inches so I can place a a box for row of 3 solar charged batteries behind the gas tanks, what would this do to tongue weight? I am going to have to clean off the surface rust and paint to protect the metal. What is the listed weight for a 1960 Tradewind? What is the tongue weight? Cannot find this information.