I vote California-
I hit one bump on I-15 in California north of Temecula, My wife was following the 5th wheel in her car she said all four tires on the 5th wheel came off the ground. As I was pulling onto the street we live on the right rear spring on the 5th wheel broke at the rear shackle end. I don't know if the freeway jump cause this or it was just time for the spring to go since the trailer was 20 years old. I replaced all four springs.
On I-5 near Valencia we hit a bump and the door of the refrigerator came off. We didn't know it until we stopped a little later and had to clean up the mess.
On I-10 near Barstow, CA I saw a semi truck pulled over just past a bad bump in the highway. He was carrying a load of 50 gallon drums in an enclosed trailer...I knew this because the trailer had bent in the middle and the sides of the trailer opened up exposing the cargo.