Getting the 5th wheel ready for our next long trip. It has been sitting for almost a year, and the wife says it smells "moldy" inside. I've shampooed carpets, wiped down all surfaces, cleaned the AC...
After a little while inside she will not smell it either. Go outside for a while and then back inside to hunt for source.
If it is mold/mildew then a trip to warm dry area will help, at least until you get back to E. TX. Check all the cabinets, drawers, etc for a damp rag or similar item. Maybe the carpet under the bed, open everything and air it out with some baking powder on the carpets.
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