It's hard to tell from the pictures, but the connection that has the problem, doesn't look like it was crimped with enough force to make a solid connection. A loose connection will certainly cause overheating as the current flow is through a smaller surface area, rather than spreading it out over the entire connector where the wires are fitting into. I would re-wire that connection, using the correct size wire and of course a new spade connector. Once complete, DO NOT put the switch back in place just yet. Turn on the switches and monitor how hot things get. If your trailer doesn't have LED bulbs for those lights, it might be something that you want to consider also. At any rate, turn all the stuff on and monitor the temperatures for at least 10 to 15 minutes to see if things get hot. Hopefully you have found the problem. When you make the repair, make sure to use new wire, a new connector, and put a very good/hard crimp on it. If it still overheats, you may have too much on the one circuit that feed the switches.
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2016 F350 King Ranch Crew Cab Dually Diesel 4x4
2018 Grand Design Momentum 394M
2023 Suzuki GSX-S1000GT+
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