I would suggest running water at the sinks, the toilets, and the shower, and check for leaks. I would also spray water on the windshield and run the wipers at high speed. Check the auto leveling system with a bubble level to ensure it is properly calibrated. Check the stove to ensure it is level. Run the generator under load for around 10 minutes. Finally, I'd go under your new Challenger with a flashlight and check for problems (I found a broken weld on the exhaust pipe).
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