Here, rust is always an issue, why my 1997 Ford F350 4x4 crewcab diesel sleeps all winter. Never been in the snow. Bought it new in 97, last new vehicle I ever bought. I buy all of them used, off lease now. Actually, my 14 Focus RS is holding up quite well as I rarely gets driven in the snow and salt either and if it does, it gets washed off underneath asap.
My wife bought a Ford Transit van new in 2010 and it's a rust bucket but it runs like a sewing machine so she keeps driving it. I figure when the frame breaks, will go to the bone. Besides, keeps her Suburban nice, it too stays in the garage in the winter.
Road salt is hell on any vehicle. Curious to see how the aluminum bodied Fords hold up. Aluminum rusts too... Just white rust, not red. The Fords are all 'glued' together with 2 part epoxy.