Nice coach. No doubt you will enjoy it. Late model coaches have skins with "mill finish" aluminum. Somewhere in the late seventies/early eighties AS switched to this finish aluminum from Alcoa. This gives the skin a "brushed aluminum" appearance. They are typically clear coated and this clear coat usually fails at the roofline first, then moves down the coach, giving them a "splotchy" appearance.
Now relax, because you can get your trailer to polish. My 86 Motorhome has the same finish as your trailer and I've test polished the nose of mine to a near mirror finish last summer. I plan (hope) to finish the job this year.
There is a lot of conflicting information out there about how best to acheive this, especially on later model coaches, but this picture from "The Polishing Guru" should help prove that it can indeed be done.
This is a picture of a later model 34 limited that has been polished and for those who don't think a later model motorhome can be polished, here is a picture of a polished 345! (This has my inspiration to polish mine!)
Love that shine.
You can contact the folks that did these two projects here: http://www.thepolishingguru.com/