My trailer is at seasonal site and its tank valves remain closed - until it needs emptying. re: Our TT's tanks can remain "as is" up to 4 weeks before I need to open its valves. For its rear slide, it goes out in spring and it comes in at fall time. And to help keep critters out of TT, I inject spray foam within its lower corners. For its front awning, it goes out in early summer (after windy May) and rolls up in early Sept. Our awing has both 3rd horizontal and 3rd vertical post. Without these extra support posts, it would go out on Friday Night and back in during Sunday night.
At your seasonal site, "ask around" on their slide, awning positions. At my seasonal sites, the beach front TTs cannot use awnings. re: The wind off lakes eats awnings each weekend. But in some bush locations (like my TT), its slide and awnings remain out - without damage risk. Each TT's exact site does vary...
