just a quick welcome to the forum and to let you know I moved your post about a specific question from an existing thread announcing this forum's start a few years ago.
It's always best to start a new thread for your specific question rather than tag your question on to some other thread, especially a generic announcement thread.
I added detail to your thread title as well. Hopefully others will see this and be able to respond with info.
I think the first question I'd have is... is there rust showing on parts or is it really rusting out - as in falling apart due to rust through? You're in MN, so that puts you close to the Winnebago factory if you feel this is a manufacturing defect? Also, how long is the chassis warrantied? That would be a question I'd ask as well.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad