The break away battery should charge from the truck. Good or bad, when connected to the truck there should be truck battery voltage present. (Engine may need to be running depending how the truck is wired.) If the battery is over a couple years old you can assume it's bad.
If you're going to be using the trailer on the highway, and you suspect it hasn't been off the farm for a while, now would be a good time to pull the drums, inspect and pack the wheel bearings, and check out the brakes and wiring while you're in there.
Trailer manufactures are notorious for shortcutting wiring, leaving wire hanging down, routing it through pinch points, and using those TOTALLY WORTHLESS blue fold over connectors! If it has the fold over connectors, might as well replace them now (solder and heat shrink) or forever have wiring troubles.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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