IKEA cabinets tend to be quite a bit heavier (lots of thick, heavy mdf/particle/fiberboard) than the lightweight cabinets used by Airstream. I would definately be concerned...especially with any uppers hung on the walls, which are attached to the skins and not the floor.
Also the curved nature of the trailer's body would make pre-fab cabinets difficult to use out of the box without a lot of customization...
Shari
