2011 X19H here. Very similar setup. You will probably want to get an new battery for sure, and replace it with a deep cycle battery. That is a Marine starting battery, not as good for camping. If you boondock at all, consider upping to a group 27 battery (your is a group 24), slightly bigger battery box required (not expensive), but you will get a bit more run time off grid.
That green wire and fuse holder should connect to the wire nut with the black wires and then to the positive terminal on the battery. Wish I could give you a picture, but mine is buried in several feet of snow still. I expect if you pulled open that wire not you would find the broken end of the green fuse wire still in there.
No PTJ on your trailer to worry about - Kiwi didn't come with it and I can tell from the picture that one hasn't been added.
With a 21C you should also have electric trailer brakes. There should be a breakaway switch mounted nearby on the frame. The wire from this should also go directly to the positive terminal (not through any fuses!) If it is ever needed you don't want it fused - you want full power to the brakes on the trailer.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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