I know this may seem odd, but I noticed when I put the tailgate down on my week old Longhorn, the tailgate cables were not even. Meaning, when the right cable is taut, the left cable has slack. This makes all the weight placed on the tailgate be supported by only the right cable. I tried putting weight on the left side to see if it was close to providing support/becoming taut and it wasn't close. I have not been to dealer yet, just seeing if this is common.