I was looking around under my 2019 SD today and noticed that there is double wall on the rear (box side) wheel well archs. There also appears to be foam in there as well. To me this is a recipe for corrosion as it has been in previous models. Has anyone else seen this with there late model SD? I also noticed that the cross members on the bed seem like there joined with an orange adhesive.😦.

 

It's a combination of body panel adhesives all the trucks have it. The orange adhesive is used extensively in the body also. The previous model trucks were also steel so while aluminum does corrode it should be a much slower process. So far haven't seen or heard of any corrosion issues and the truck cab is going on 5 years old now.

 

I noticed on my wife's '18 F-150 There is a drain hole at the top of the arch also. If you stick your head up inside the wheel well your can see it. I was disappointed to see that Ford is still using foam in there but I don't that'll ever change.