We live in upstate NY too and have a seasonal site for out class A.
I close up the slides and the awning after every weekend. In the beginning I used to leave them out until we decided to use it to go on a trip. Noticed that our slide toppers held some water and was growing some algae on it. Also I wasn't a big fan of the spiders that built a web between the topper and the slide and then decided that the inside of the MH was there new home when I closed up the slide.
Don't want to take the chance of the awning coming down when one of those summer thunder storms come through either.
We dump our tanks after every weekend. By then they usually have a good amount in them anyway plus if you miss a week in the hot summer sun they can become a bit ripe when you flush. After I dump I fill them up with 10 gallons of clean water and then dump them again. Then a gallon or so with some chemical and they are always clean.
For maybe 30 minutes of work you know your rig is in good shape just in case you can't make it back when you planned.
