Hi Ed, I've never been in a 90's airstream so can only speak for 60's. The fiberglass end cap goes up first then the side skins. In order to get the end cap on those down you had to remove the lower interior sheet metal, and at least losen enough toget out of the of the way a few feet of the upper wall and ceiling sheet metal to get the end caps out of the way. Someone probably has much better info than I do. Nothing about interior work is hard, it just takes a lot of time. Even the end caps can be lifted down with one person, two is much easier. Not sure you'll get 100% of the dent out but probaby make it much less noticable.
Scott & Megan
VAC LIBRARIAN WBCCI 8671
1963 Safari from the 1963-64 Around the World Caravan