[Pahaska]

I have had some experience on my 3 Airstreams that makes me think that the assemblers simply grab whatever screw is handy. I replaced a lot of screws on my International 22 as undersize.

The worst example I had was a 3" screw that was inserted under the sink to attach the sink cabinet to the sliding pantry adjacent. The screw hit the drawer slide that the pantry hangs on and put an "S" curve in it. That resulted in a balky pullout pantry and finally the slide failed altogether. That's when I discovered the long screw. A proper screw would have been about 1 1/2" at the most.

I think they have a big box of assorted screws and just grab what seems appropriate.