Leaky roof is biggest thing. Look for water stains on ceiling. Check for soft spots. Same on floor look for soft spots from water leaks. Make sure to have the fridge fired up as they are expensive to fix or replace of it has an issue. Run furnace and pressure up with water and make sure pressure holds and water pump doesn't keep running or burping when pressured up. Sign of water leak somewhere. Check lights on trailer before you leave and make sure you have a battery on the trailer for the trailer brakes to work properly. Lots of other things you can do but there is a good start to common issue areas.
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