Hard pipe your dump valve - yes. But no, never leave your tanks open, especially the black tank as it requires a decent amount of liquids to properly drain.
On our fifth wheel, I always put the slides in when we leave. Other people in our park look at me funny and ask why I always close it all up. I'd rather take the 30 seconds to close it all up and ensure its totally closed as opposed to having the slide seals exposed to the sun all summer and drying them out.
I bought tire covers but haven't skirted out fifth wheel in yet - mainly due to cost and time.
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