I read a forum on rv.net (I think) the other day and a women said they were driving on a freeway and her plastic fender flew off. Well prior to reading this,I was looking over my new rig and noticed they used sheet metal screws to attach the fenders and upon further insp. I noticed a lot of them were loose and had double holes. So I decided to fix THIS, and went and bought machine screws and fiber lock nuts,they will never come off. Ive been a technician/mechanic since dad taught me to turn a wrench at the age of ten. Anyway as I keep going over my new toy,I am finding these little nuances. We love our new coach, but I would think Keystone would do a little better job. FYI, I also found a small ripple on a slide out lower sheet metal panel and a splintered wood support under the bed. I hope this helps someone not loose there fender