Pic one is likely something to do with a seat mount is my guess. Regardless of that it’s now an expensive pice of aluminum to replace. Sand it and cut it with a circular saw with a carbide blade and use it for something else. I gave $60 for a 20 X24” piece of 1/4” mid grade aluminum. It’s worth putting aside for later.
The second is known as a trolling plate, several good brands over the years. When they’re set up with good cable and hardware they allow you to control trolling speed by letting it down more or less, not just all the way down.
The rest are lights for night fishing and I would also put those in a box for a while. Night fishing in the hot months is a thing and you dont want to pay to replace them either. The light with the 3 LED’s would do well for an added reverse light on the back of the truck. One of the best upgrades I’ve ever added.
No clue on the black bracket. The roll on trailer jack never worked for me. Test the inverter before you have to count on it. Good to have around at times, like charging phones when the power is out.
Creativity is just intelligence fooling around