It seems like you've got the answer ;-)
I’ve used the iPad to proof 1024x600 folios in the past using the Adobe Content Viewer. In actual practice? No, I haven’t tried it.
The iPad will only display appropriately sized docs. When the app calls into our distribution service for content, the device's screen dimensions are passed as a parameter and only those matching the size are returned.
// James Roche
// I was born lucky