Mine was on a 98 24xxx Wildwood that had an ext. pin box and it was on about 1 year. No frame or weld breakage but I could see the box flex at least 1"+ in the mirror, on rough roads. That's about 1/2" more than before the g-neck. We made a record time trip one night in strong head wind from Denver to Woodbine Ia to meet up with my sis and went on to Gavins Pt. SD. The night before we left Gavins Pt. to go to Starbuck Mn. I noticed the alum. siding at the bedroom area was bulged way out and I went inside and found brads from the paneling laying in the carpet. The flexing popped the heads off the crown staples in the siding. That's my story and I'm sticking to it! FWIW, I had that 97 CTD turned up and I used to tell my friends it felt like I could tear that trailer in half. I had a good start! Craig