I too have found what several of you have also posted - I was driving down the Calif. interstate 5 and the road was a little rough - looked out my side mirror and saw my driver side plastic fender skirt snap off and fly to the side of the interstate. Why was that fender not made in metal !!
Also had my kitchen drain line (hard plastic) snap when I opened the slide on the Cardinal fifth wheel (found that out when I turned the kitchen sink faucet on). It was quite a lot of work redoing it correctly. I can go on for another hour regarding issues with this unit - but I think the Mojave sun/heat is doing most of the damage.