Yep, they rust out like crazy. I see new dodge trucks with rust holes, and I'm really not sure why. Not enough under coating? Painter failing to paint entire under side of bed? who knows. Shameful indeed.
they dont under coat them period. They want to charge extra at the dealerships to do that now. My jeep came completely without undercoating. I ended up working it into the sales contract and got a decent deal to have it done.