How much power does that trailer actually produce in a given day? When I google "Average kWh rate Utah" I get roughly 10 cents a kWh. At 10 cents a kWh, how long would you need to leave your car plugged into that trailer to break even on the 5k you spent on it?
I am struggling to see the end game on this one, especially since a model 3 cant tow the trailer, and a cybertruck which could tow it, will have larger batteries, so throw the "total time to charge" off even higher.
Other than a novelty of "I can do this so I did" (which I get, if that was the case), I am struggling to see how this makes any sense.
Rooftop solar also powers your home, and is likely a lot more power than that rig would generate... but maybe it generates more than I think.