HOW DO YOU KNOW THAT THE WOOD WAS NOT KD?
Moduline has a strong reputation for good quality construction. Anything is possable and I can't see what's happening from here but the symptoms sound a lot like a manufactured home that has either been installed incorrectly or has experienced serious settlement.
Most homes continue to settle for many years, but the majority of settlement usually happens in the first year. In our area most manufactured homes need to be re-leveled during the first year. After that most dont see enough settlement to make any difference. Homes moving out of level are not uncommon and can be an expected problem in the many northern places where you get ground heaves from the earth freezing and defrosting yearly. (depending on soil type and compaction and foundation conditions)
You can read these free articles:
Is your manufactured home unlevel?
How Level Is Level?
If you think settlement might be contributing to your problems find a licensed installer and ask him to check the home to see if it is level. If your into doing-it-yourself it is not difficult to check a homes level. It is done using a very simple tool called a Water Level.See Using a Water Level