Our 08 30 FB has a broken rear pano window, does anyone have expeience with replacement?

We just purchased a new 08 30FBk , we loved the layout however the wheels needed to be replaced due to a signifficant amount of corosion, so Airstream sent new replacement wheels under warrantee. The wheels came in boxes labeled "made in China".
Does anyone know how to prevent this corrosion and pitting to occur, has Airstream changed their process to prevent this?
Can I expect these new wheels to look like the replacement ones in a year or two?

Does anyone know where you can find reviews on Airstream dealers and can share their experiences, good or bad?