Nirenberg, David wrote:
If I put dry skis in the roof box on my car a week before I travel (when its
convenient to pack) will I rust my edges?

Get an old iron and some canning parafin from the grocery store and melt
on a good healthy coat of wax on bottoms and edge sides both. Take the
iron and parafin with you for the return trip.

BTW, you should do this in the spring also, before storing your skis for
the summer.